What kind of bird might be singing a short, unmusical trill in my wood margins?

I am in the NE and have heard this song for years. It’s obviously a common song bird. I would have guessed the junco (who is omnipresent) but the song seems too short and too abrupt. It doesn’t sound quite like either the chipping sparrow or pine warbler either. (Maybe it’s a junco with a cold or a bad teacher?)