I love John Cages' definition of music as being "organized sound".
To be precise, this definition does not originate with John Cage, but with Edgar Varèse. Although he uses the definition at some point (in his Credo), it is in contradiction with his later music through which he displayed a much broader definition of music that did not necessarily involve "organization" (through chance operations) or "sound" (his silent compositions).
Some interesting ideas for further practice in the rest of your post... please get a webcam!
