Some sort of steem integrated music library (itunes, Google play, etc) would be very cool to have. Offer selections of steemit musicians with options to purchase albums or individual tracks based on a selected price of steem/sbd. I just made a post last week about potentially releasing an album exclusively through steemit and I'm sure I'm not the only one who would find something like this useful. Plus with the state of the digital music world lately, a steem-integrated app for artists to sell could end up huge! It is significantly easier to spend steem on music than actual dollars, and doing so before it even transfers to BTC or your bank is way easier and a little more painless. Could be a cool market if it was promoted well.