Alan Graham, of The Open University, explains the mathematical origin of sine curves and also uses a bodhrán (Irish frame drum) for an example.

Transcript -- Musical frequencies

Math can be applied to pretty much everything in existence, and music is of no exception. Across this album, The Open University's Alan Graham shares his wealth of knowledge on the relationship between music and math, demonstrates many easy-to-follow theories and examples, and performs several pieces of traditional music with his band Betty's Kitchen. This material forms part of The Open University course MU120 Open mathematics.