I love that these type of apps are popping back up. However, I fear that the RIAA is going to ruin all the fun like they've done in the past. I used to run a site in which we just played random music with no ads/no revenue. We still got a cease and desist letter giving us no choice but to shut it down. I get why they exist, but they are more about stomping out sites rather than working them to figure out a path that is lucrative for everyone involved.