Timbre saliency is defined as the attention-capturing quality of timbre. Saliency differences between timbres were measured using a tapping technique in which the stronger beat in ABAB isochronous sequences was reproduced by the listener, the idea being that the more salient timbre would capture listeners' attention and be chosen more often as the strong beat. A timbre saliency space was defined in which the distance between a pair of timbres corresponded to the difference in timbre saliency. Stimuli were generated with 15 orchestral instruments, equalized in pitch, loudness and duration. Data from 40 participants yielded a one-dimensional CLASCAL solution with two latent classes and specificities. Latent class structure shows no relation with gender, musicianship or age. Testing audio descriptors from the Timbre Toolbox [Peeters et al., 2011, J. Acoust. Soc. Am., 130, 2902-2916], the odd-even harmonic energy ratio explains 51% of the variance along this dimension. A combination of tristimulus (band 3) and odd-even ratio explains 73% of the variance in the mean saliencies of individual sounds across all other comparison sounds. Mean saliency thus seems to depend on the high-frequency harmonic energy and spectral envelope jaggedness, whereas saliency comparisons between timbres depend more on spectral envelope jaggedness.
Changes in instrument combination patterns in Western classical orchestral music are traced over a three hundred year period from 1701 to 2000. Using a stratified sample of sonorities from 180 orchestral works by 147 composers, various empirical analyses are reported. These include analyses of instrumentation presence, instrument usage, ensemble size, common instrument combinations, instrument clusterings, and their changes over time. In addition, the study reports associations of different instruments with various dynamic levels, different tempos, pitch class doublings, affinities between instruments and chord factors, as well as interactions between pitch, dynamics, and tempo. Results affirm many common intuitions and historical observations regarding orchestration, but also reveal a number of previously unrecognized patterns of instrument use.
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