I think I get it in a couple of sentences for the lay person.
Buy/Sell/Trade shares in your favorite bands, artists, groups with the tokens that are created by those bands, artists, and groups through bitshares music DAC.
Buy music through peertracks & possibly cash in some tokens if the band declares 1 token is worth 1 download or something.
I believe, the plan is the token holders to get paid whenever somebody buys a song. In that sense you get paid more when the band sells more songs, as opposed to the price to be determined by the bands themselves.
That's exactly it. When you own coins for an artist, say OneDirectionCoin for example, you get a small percentage of all their sales. If you thought they were the sh*t before everyone else did and bought their coins cheap you'd be doing very very well right now. This is why early coin holders become instant grassroots marketing for the band.