This must have happened to you, and it happened to me today: I heard a song on the radio, really liked it, but didn’t know what it was. The radio station in question is the Bay Area’s 95.7 (which has gone from techno to classic rock to country over the past few years and is now “70s, 80s and Whatever we feel like”). I went to 95.7’s website, and found a page called “What Was That Song“. Sure enough, I found the song I was looking for (“Promises, promises” by Naked Eyes) by putting in the date and approximate time I heard it.
Every radio station’s website should have this. Period.