Does this happen to you? A song comes on the radio and you realize that you completely love it, but had in fact completely forgotten that it existed. This happened to me with "Cathedrals" by Jump Little Children today. All I could come up with at the time was "Oh my gosh! That was on [my former roommate's] iPod! I love that song!" I had to Google afterward to figure out what it was. Take a listen: