need help finding the name of this song and who sings it?

There's one part of the song, i think towards the end where it just
goes "na na na na, na na na naa, na na na na, na na na naa" and i
think it's sung by a guy in a band. I've heard this song in movies a
lot. I remember it was in one movie and I think it was played during a
school dance, but i forgot the name of the movie. It might be an
acoustic song or idk what?