Is there a specific term for when a song has different vocalists singing different melodies at the same time? I know that polyphony refers to multiple simultaneous melodies, but is there a term specific to singing?
A song with an excellent example of what I'm asking about is Hello Seattle by Owl City (Spotify link). At the end of the song, the chorus is sung at the same time as a verse. Another example of this is at the end of Feeling This by blink-182 (Spotify link) (mildly not safe for work).