With the app Shazaam, you can easily identity music by just keeping your cellphone near the speaker, and after it records a bit, in a few seconds the song is identified. I have it on my E71 and have used it a lot. But suprsingly, the application hasnt been made for the N900.
Dominique Rohr has started a petition for the Shazaam to be ported onto the n900. It won’t take more than 15 seconds of your time :). Plus, it will make waiting for the n900 easier (maybe not)