If you are in to music like me, you may deal with the same situation I find myself in a few times a week. I am listening to a classic rock station on the radio and they play a long lost classic that I do not have or have not heard in a while. I think to myself, I must get this when I get home. (I do not have an iPhone, so I can't use Shazam)
Then, by time I get home and remember that I heard a song I wanted, I have forgotten the tune and even the band if the DJ mentioned it at the time!
Well, you can worry no more. YES.com keeps track (or brings together from other sources) of all songs played for the past 7 days of each radio station, or at least the ones I checked. It also gives the time of day the song was played, so if you know you were in the car around 7:30pm and were listening to both WKLU and WJJK on the way to the store, you just put it in and get your song list!