I don’t see why not. You are not downloading it onto your computer, just viewing/listening.
You could also probably find the songs on playlist.com. And on playlist.com, just like YouTube, you are not stealing the songs since they are not in your posession to do as you will (like mp3s which you can put on an iPod or CD player, etc).
I really miss the days when Napster was legal. Believe it or not (and I can believe it, having been in several bands), there were plenty of bands who endorsed Napster and thought it was an awesome thing. I wanted as many people as possible to hear my music, so I was always willing to post it online for free. I didn’t think it hurt me; infact, it gave me a larger fan base.
I personally think that from a promotional and musical standpoint, music downloading is a GOOD thing… BUT, that is another tangent, I suppose!