Sound is something of an ephemeral phenomenon, existing in the moment that vibrations travel through the air. Those vibrations also exhibit distinct patterns, depending on frequency, which can be ...

Notes with frequencies that are in simple whole-number ratios, like 1:2, 2:3 or 4:5, sound good when played together. This is the basis of musical harmony. After unison (1:1) and the octave (2:1), the ...