Site that shows past songs played on radio?
 

I know there is a site that has every radio station and will show what songs it played at what time. Can anyone help me out with this? like if you know a song played at 2:40 you can look at the site when you get home from work and find out what it was.

The only way that is possible is if the station you are listening to makes available their daily on-air playlist on their own website. There is currently no (known to me) company or product that scans broadcast radio stations and automatically creates a playlist by what is played, or a site where humans contribute heard playlists.

Example - KCRW http://www.kcrw.com makes available their daily playlists, and archives them, on their website.