Chorus Familiarity

When you don't recognize a song until the chorus then you know it instantly.

Probably most likely due to 80s and 90s commercials for music compilations where they only played snippets of the catchy chorus but not the rest, and lack of access meant if you weren't already familiar with the song you only had the chorus to go by.

Can also apply to songs you only know as samples.

I didn't recognize Lovergirl until I got to the chorus, then I got Chorus Familiarity.