Ooh, Musicovery is awesome. I'm not really a big "background noise" person (I get distracted far too easily), but I've found that Musicovery is good to just leave on while I do other things. I think that it has something to do with choosing the music based on my mood - if the song goes along with how I'm feeling, it doesn't tend to distract me as much (and I don't feel the need to change it every 20 seconds).
Plus, like you said, the interface is beautiful.