LITHOACOUSTICS - MUSIC IN STONE

Preliminary report (October 2000)

(A more complete version of this report can be found in the volume of British Archaeological Reports referenced below under 'Publications' - click here for a preprint version)



Introduction

There has been much recent debate over the role, if any, of music in cognitive evolution (for an excellent account of cognition in evolution see Mithen, 1996; for a very broad overview of music's evolutionary origins, see Wallin, Merker and Brown, 2000). Some theorists such as Pinker (1997) see music as a byproduct of the evolution of certain adaptive faculties, while some, such as Miller (1997) see its origins as lying in mechanisms of sexual selection; some writers such as Vaneechoutte and Skoyles (1998) see music's provenance as phylogenetically very ancient, while others such as Merker (1999) argue for a much more recent derivation. It has also been argued (Cross, 1999) that music arises only with modern Homo sapiens sapiens, and that musical behaviours are not only functional in ontogenetic development (see Trevarthen, 1999) but have been adaptive in human evolution.

But there is no clear prior evidence for the exercise of human musicality - for musical behaviours - prior to some 36,000 BP (a bone pipe discovered near Württemberg, see Dauvois, 1989), though the existence of the capacity prior to that date must be inferred (see Lawson, 1999). It might be that previous musical behaviours took an entirely vocal form - thus leaving no recoverable traces - or it might be that early musical instruments or artefacts were made of highly perishable and hence virtually unrecoverable materials (reed-stalks, or bark tubes). It might be, however, that early musical artefacts exist unrecognised in the archaeological record; there are certainly prior cases of misidentification of sound-producing artefacts.

This project was intended as a pilot study to explore whether there might be evidence for sound production - and hence perhaps music production - by means of instruments or artefacts that is recoverable from the lithic record. The study focused on those lithic objects of which the properties were perhaps best known in Aurignacian times, flint tools - blades, flakes and cores - and investigated (i) whether these could be used to produce sounds that might be exploited musically and (ii) whether the use of such lithic objects for sound productions left consistent and replicable traces of use-wear that might serve a diagnostic function for archaeological specimens. To leap to the conclusions that can be drawn from this pilot study, the answers to these two questions appear to be (i) yes and (ii) probably.

Evidence for the use of lithic objects in the Upper Palaeolithic to produce sound can be found in Dams (1985). These reports concern the exploitation of stalagmitic formations, which afford differently pitched sounds when struck, in caves in France (Roucadour, Cougnac, Pech-Merle), Spain (Nerja) and in Portugal (Escoural). Dams indicates that many of these lithophones are decorated or marked, often with red ochre dots, pointing to an intentional and repeated use for sound production which (op. cit, p32) "can be observed by the traces of blows, damaging or chipping the surface".

Hence if natural lithic objects were being used for sound production in the Upper Palaeolithic, it seems logical to examine the possibility that the sonic potential of artificial lithic objects of the type most common within that period's culture(s) might have been exploited. As the sites listed by Dams appear to have had multiple periods of occupation from the Périgordian to the Magdalenian, it appears most reasonable to focus on the tool-types and shapes used in the longest-lasting culture of the European Upper Palaeolithic, the Aurignacian.

The experiments

As a starting, point, it was noted that the process of flint-knapping necessarily involved the production of sound; further, the repetitive actions that can be employed in knapping might have led to an awareness of the "musical" potential of the materials and the actions. Hence the initial hypotheses that we had developed (presented on the first version of the Lithoacoustics page) focused on the actions likely to be required to use lithic objects to produce sound and the possible consequences of these actions for the lithic objects.

However, as soon as the project's flint-knapper, Frank Cowan, started to produce Aurignacian-type blades and flakes, it quickly became evident that these materials possessed sound-producing attributes that could only be elicited from actions extremely different from those involved in knapping. Consequently the focus of the experiments quickly broadened to explore aspects of materials and use-wear, as it became evident that repeated use for sound-production appeared to result in quite distinct patterns of surface and edge damage to the lithic objects.

The initial informal "play" with the "Aurignacian tool kits" indicated that the most "musical" sounds were producible by lightly coupling blades or flakes between thumb and index or middle finger and using them as "chimes". Empirical observation of the most effective way of eliciting pitched sounds, together with some basic acoustical knowledge, led to the conclusion that the blades were indeed operating acoustically as "chime bars" (see Fletcher & Rossing, 1998, pp624-633). The "best" sounds were produced when the blades were suspended between the fingers at a point approximately one-quarter along the length of the blade (in fact, 0.224 of the length).

Materials were approximately 8-10 inch cobbles which bore considerable surface incipient cone cortex (from glacial gravel outwash. The raw material was, on the whole good though variable in quality, frequently being heterogeneous in texture with occasional flaws or cracks. All protocols were derived from informal pilot testing of the materials, and enabled: (i) the form of the lithic objects (specimens) to be classified; (ii) the mode and "quality" of sound production ("good", "acceptable" or "bad") to be described and recordings to be made; (iii) the analysis of the recorded sounds to be encoded in reduced form; and (iv) the resultant patterns of use-wear to be characterised. All data were input into a central database (using Microsoft Access), and raw data in the form of recorded sound and image files were stored as, respectively, mono 16-bit AIFF files and JPEG files. A single rater (Lis Fleming) was employed to undertake the bulk of the recording and lithic percussion (some 109 specimens in all); an additional rater (Paula Constant) was employed to percuss and record a further 15 specimens to examine the effect of rater on the measured outputs.

Results

Initial analyses focused on the principal component of the spectrum of each recorded sound, examining the mean, range and variability of frequency, intensity (with -80 dB noise floor) and duration of this component.
mean: frequency (Hz) duration (msec) intensity (dB)
good 4825 185 -36
acceptable 7125 116 -36
bad 7764 85 -43

It is notable that only the specimens rated as "good" had principal frequency components that lay within (though at the upper end of) the usual "musical" frequency range. Further analyses of playability ratings showed that these were consistently related to physical properties of the specimens, in particular, to both length and thickness. The results indicated that to a "player" a heuristic indication of the sound-producing capacity of the specimen is immediately available from estimation of its length and (secondarily) its thickness.

Samples of some of the sounds produced are given below. All were rated as "good", and all produce clear, pitched sounds. All sounds are in AIFF and WAV format (16-bit 44.1 KHz).

AIFF format resonator 6 resonator 16 resonator 24 resonator 66
WAV format resonator 6 resonator 16 resonator 24 resonator 66

An analysis of one of the sounds rated as "good" (using the very wonderful Lemur 4 - for details see the CERL Home Page) is shown below, together with the sound sample from which the analysis derived.


resonator 1 (AIFF) resonator 1 (WAV)

A short "lithic piece", put together by sequencing some of the recorded materials using MOTU's Digital Performer software, can be accessed below. The "piece is in RealAudio format, and you will need a version of RealPlayer to hear it.

"Lithic piece"

Preliminary analyses of use-wear showed a consistent appearance of small densely clustered surface cones or of multiple small, densely clustered small areas of surface polish results from sound-producing use of the specimens. Occasionally, small scratches occurred. Of the three different kinds of damage, the cone-cracking was most consistent and is undoubtedly the most diagnostic usewear criterion. No other behavioral or geological forces that we can think of are likely to produce the kind of very patterned clustering of cone-cracks as were experimentally produced in musical use. Microscopic images clearly show the patterns of use-wear resulting from this musical use; images of one of the specimens (distal end, hence the capital letter "D") before and after repeated percussing are shown below:


A preliminary survey of some of the Palaeolithic flint materials in the Cambridge University Museum of Archaeology and Anthropology indicated that there were very few instances of blades or flakes with small surface coning; if this type of use-wear ocurs as a result of "natural" circumstances it would appear to be rare and differentiable from the sort of wear that arises from lithic chime percussion.

Preliminary conclusions

This project is still in its initial stages. There remains much to be done; for example, full coding and analysis of use-wear on all specimens is yet to be completed, and may reveal patterns that are relatable to sound-producing and dimensional characteristics of specimens. And it must be emphasised that while the aims of the project - ascertaining the "musical" potential of Upper Palaeolithic-type flint materials, and determining whether or not diagnostic criteria for such use might be evident in use-wear - have in part been met, we still do NOT know whether these types of tools were in fact used to produce sound in the Upper Palaeolithic. We have at present ONLY the beginnings of a testable hypothesis that might enable the identification of sound-making use of prehistoric flint tools. Many other factors need to be considered, and much work remains to be done, before we can know whether these hypotheses can shed light on the origins of human musicality.


References

Cross, I. (1999). Is music the most important thing we ever did? Music, development and evolution. Music, mind and science, Suk Won Yi (Ed.), Seoul: Seoul University Press, pp10-29.

Dams, L. (1985) Palaeolithic lithophones: descriptions and comparisons. Oxford Journal of Archaeology, 4(1), 31-46.

Dauvois, M. (1989) Son et musique paléolithiques. Les Dossiers d'Archéologie No 142: La Musique dans l'Antiquité. 2-11.

Fletcher, N. H., & Rossing, T. D. (1998) The physics of musical instruments (2nd edn.) New York: Springer-Verlag.

Lawson, G. (1999) Getting to grips with music's prehistory. In Experiment and Design: Studies in Honour of John Coles, A. F. Harding (Ed.) Oxford: Oxbow Books.

Merker, B. (1999). Synchronous chorusing and the origins of music. Musicae Scientiae, Special Issue. 59-74.

Miller, G. F. (1997) Protean primates: the evolution of adaptive unpredictability in competition and courtship. In Machiavellian Intelligence II: extensions and evaluations. A. Whiten & R. W. Byrne (Eds). Cambridge: CUP.

Mithen, S. (1996) The Prehistory of the mind. London: Thames & Hudson

Pinker, S. (1997) How the mind works. New York: W.W. Norton.

Trevarthen, C. (1999) Musicality and the intrinsic motive pulse: evidence from human psychobiology and infant communication. Musicae Scientiae, Special Issue. 155-215.

Vaneechoutte, M. and Skoyles, J.R. (1998). The memetic origin of language: modern humans as musical primates. Journal of Memetics - Evolutionary Models of InformationTransmission, 2.

Wallin, N.L., Merker. B., & Brown, S. (Eds.) (2000) The Origins of Music. Cambridge, Mass.: MIT Press.


Project researchers

This project is funded by a British Academy Small Grant (SG-30046) and is being conducted by Ian Cross in collaboration with Professor Ezra Zubrow of the University of Buffalo and the Department of Archaeology, University of Cambridge and Dr Frank Cowan of the Cincinnati Museum Center, with the assistance of recent Cambridge music graduates Lis Fleming and Paula Constant.


Publications

Cross, I., Zubrow, E. and Cowan, F. (2002) Musical behaviours and the archaeological record: a preliminary study. In J. Mathieu (Ed.), Experimental Archaeology. British Archaeological Reports International Series 1035, 25-34.

Zubrow, E., Cross, I. & Cowan, F. (2001) Musical behaviour and the archaeology of the mind. Archaeologia Polona, 39, 111-126.


Media Web Reports

The Lithoacoustics project has been reported on by both ABC and the BBC - see their Web sites at ABC News and BBC News.


Last updated 17.06.02 by Ian Cross
Return to Ian Cross's personal page