I'd like to expand on the complementary facet that has not yet been approached here. The physics/signal theory behind of it. It's a great way to learn for scien

I'd like to expand on the complementary facet that has not yet been approached here. The physics/signal theory behind of it. It's a great way to learn for scientifically inclined people. Try looking at how instruments are made, and where does sound come from. Look at experimental instruments like waterphone, bells, violins, strings, drums, winds, animal noises, natural sounds, electronic music... Try looking at the way the waves propagate and interfere, learn about acoustics and how physical objects respond to incoming sounds by vibrating themselves at specific frequencies which depend on their geometries. This approach will give you the basis blocks upon which generations of musicians have built a language and cultural norms that also take into account understanding the listener and its emotions. Try to find something which interests you and dig as deep as you like.