The movie trailer comparison doesn't apply because those trailers lead directly to box office ticket sales. Trailers show only a tiny portion of the movie, while songs are streamed in their entirety. That is a big difference. A lot of people are listening to music from a computer these days and free streaming serves as an alternative to purchasing a song that may only be listened to a few times. It could potentially kill the impulse MP3 purchase (Apple...Lala... yes, they know this.) I feel a monthly subscription ($9.99??) is a fair price to pay for unlimited access to, potentially, the entire history of recorded music... so long as the artists see some of this (to benefit the little guy trying to make a living, not Metallica.) That's only fair seeing how such a service will surely detract from digital sales. But I don't see it working until these services can be accessed by car audio systems, anywhere you may drive to. Sorry, I'm getting ahead of myself.