Rafe
There are exactly four types of half-remembered songs. First, the Echo, where you only have the chorus. Then the Ghost, a melody you can hum but for which the lyrics are gone. Third is the Fragment, just one specific line that plays on loop for days. Finally, there's the Blur, where you know the vibe but not a single note. I saw a guy at the diner today trying to hum a Radiohead track. It's pathetic.