I've been using Pandora more recently, mostly because it's a channel on Roku. Tonight, however, I learned that it must have keyboard shortcuts, and that they are dangerous. I set up a Dave Brubeck "station," and the first thing up was It's A Raggedy Waltz. Oh boy!! I was messing with other things on my desk while I was enjoying the music and I brushed the keyboard at one point and up popped a message promising never ever to play that or anything like it again. Oh no!! Couldn't find anything in the FAQ to suggest an undo function. I've deleted the DB station and added one again, hoping it will forget my accidental thumbs down.
Although Pandora uses the "station" metaphor and is often billed as a radio competitor (that's certainly true to some extent), after some hours of listening now, I think it's more accurately a better iPod. I find the iPod less interesting because it's a hassle to add music to it and I get tired of hearing the same ones I've already added.
For what it's worth, here is my list of "stations" so far: Dave Brubeck, The Persuasions, Björk, Glenn Gould, The Rolling Stones, Bonnie Raitt, Lyle Lovett, K. D. Lang, James Taylor & Alison Krauss, Buena Vista Social Club, Carlos Santana, and Johannes Brahms. --Dennis