There is a great essay I read a few years back for something I was doing about participation in art. I think the guy's name was Evans. It basically traced a historical shift (as he saw it) where the arts in general, but music in particular, became something that people watched/listened to/consumed as opposed to something that people did. The system whereby we (in the main) look up to professionals to do music for us rather than playing and participating in it ourselves (having the uncle around the play a tunes on the fiddle, sitting around the campfire singing a few songs, listening to your niece playing some Bach preludes on the harpsichord in the drawing room) is pretty much a modern phenomenon.
I guess the growth in the ability to mass produce and consume music music effectively passively perhaps led to this move away from the most literal form of DIY - although Bach and contemporaries were the 'man' producing music for a limited elite....