On the hobby/gear distinction, I once heard a great interview with Sir Paul McCartney (of Beatles fame). He talked about how someone once asked him what brand of electric guitar strings he used - apparently a point of great debate among the gear nerds in the music business - and he replied "I don't know, silvery looking ones?" or something like that. It blew some minds.
For people with nine hours to spare and an interest in this kind of thing, the Get Back documentary is incredible.
Five minutes of discussing the space, setup etc. Tea break. Hour of playing random riffs and scribbling on bits of paper. Desultory not-quite-argument between John and Paul. Bored Ringo. Friendly banter. Slightly less friendly banter. Then, after hours of faffing around, suddenly there's a reluctant agreement to get back to work - and everyone launches into one of the hits they're supposed to be recording, and suddenly it's the Beatles at their peak.
