Google music search
I wrote this post a while back. The content can still be relevant but the information I've linked to may no longer be available.
Like me, you may have heard a song and searched for the song lyric and artist on Google. What was the name of that song and who sung it?! Well, here's something I didn't know.
In fact, Google has a music search facility that usually provides better results than the regular search for music-related items. Simply enter "music:" before your search term to get results from the music search database. Google Operating System has the details.