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The orchestra performance is full of sublime rich sounds. In particular, theunison of violins sounds different from the solo violin. We try to clarify thisdifference and similarity of unison and solo numerically analyzing the beat of`violins` with timbre, vibrato, melody, and resonance. Characteristicproperties appear in the very low-frequency part in the power spectrum of thewave amplitude squared. This ultra-buss richness (UBR) can be a newcharacteristic of sound on top of the well-known pitch, loudness, and timbre,although being inaudible directly. We find this UBR is always characterized bya power-law at low-frequency with the index around -1 and appears everywhere inmusic and thus being universal. Furthermore, we explore this power-law propertytowards much smaller frequency regions and suggest possible relation to the 1/fnoise often found in music and many other fields in nature.

Low-Frequency Characterization of Music Sounds -- Ultra-Bass Richness from the Sound Wave Beats