We know that the pitch of a musical note (how high or low the tone sounds) is almost entirely determined by the frequency of vibration of the sound. Frequencies in the range  between about 27.5 Hz and 4,186 Hz (you might recognise this as the pitch range of a standard piano) sound essentially “musical” to the human ear. The most "verifiable" and elegant fact in music science is that our perception of pitch is logarithmic, not linear . The musical note identified as A2 has a