In a way, you can control it. If you see a song you like that someone else has listened to, you can listen to it. But as a free user, I don't think you can build your own playlists. Paid users can, I think. But half the fun of it is seeing what it thinks you might like. And if it gives you something you don't like, I'm pretty sure you can blacklist the song or band so you never hear it again.