I'm always surprised when people are enthusiastic about Pandora. maybe I just haven't tried it enough (and/or recently enough). when I use Pandora I find that it plays a bunch of related artists that don't actually sound very similar. for instance, if I make a Death Cab for Cutie radio station, I just hear a bunch of mainstream indie rock from the mid/late 00s. I'm sure that modest mouse and dcfc are very close on an association graph, but they don't really sound anything like each other.