If you work at any radio station with a music format long enough, you'll get these types of calls at least occasionally:
DJ: (Name of station.)
Caller: Yes, would you know the title and artist of a song I heard?
DJ: You heard it on this station?
Caller: Yes, about a week ago--or maybe more like two weeks ago.
DJ: Are you able to narrow it down? Was it a vocal or instrumental?
Caller: It had words.
DJ: Do you remember any lyrics from it?
Caller: No, not offhand. I just know I liked it. I also think there was a guitar in it...a saxophone, too--or maybe a trumpet.
DJ: Um, well...
I'm sure this happens less frequently than it used to, thanks to posted playlists, but I don't doubt that it still happens.