GHOSTBUSTERS THEME SONG ACAPELLA! (ft. Chad Neidt) https://www.youtube.com/watch?v=v83rQ4xdyWg This song is from my favorite movie which is pretty old.

THE SIMPSONS THEME SONG ACAPELLA! (ft. Brizzy Voices) https://www.youtube.com/watch?v=6x6yo2vRGCM This song sung without instruments is excellent.