It's no secret that in the known universe, the relationship between music and numbers is intrinsically woven.
In order to make sense of it all - pitches, intervals, chords, scales (modes) and cadences - have all been organized by number into groups, sets, etc. For example, Major Scale steps 1-3-5 might represent a Major triad in traditional harmony, whereas in Set Class Theory, 037 might be designated as a Major or minor triad; while 013, 026 & 027 all represent non-triadic 3-note "pitch collections".
Rhythms are grouped into repeating cycles - 4/4, 6/8, 7/4, etc. in various ways, across many different cultures.