Rediscover Communication

Has anyone noticed that some songs on the radio seem to be played faster than their corresponding CD tracks? Maybe it is just me... I was listening to Happiest Days of Our Lives/Another Brick in the Wall II on the radio, and it seemed to be a little faster than the album track, which I have listened to 3 or 4 hundred thousand times. It wasn't a whole lot faster, but slightly noticable. It would make sense, if they can put the same number of songs in a shorter period of time, they can sell more advertising. an extra 30 second slot an hour would make a big difference and wouldn't be that hard to do.
I suppose it is easier to do with longer songs, because they are more expensive to play...
oh well. Anyone else notice this?