No Mark, you are on the wrong trail. If, for instance, you defined house music as having a bpm (beats per minute) of 120, then trance 140 bpm etc, in a contract or product definition then you should use capitals for House etc. Jimi and Miles have capitals because that is their chosen name. However, if you defined a guitar sound related to specific amps and effects, to Jimi's "normal" set up, then as a product (as in Amplitube) Jimi Hendrix would be a defined term.