Kraftwerk has charted a few efficient songs.
Correct (according to my sheet music).
mmm
Nice bit of trivia: the video for Once In A Lifetime was directed by Toni Basil, of Mickey fame.
Lowrider, by War.
What about “Don’t Worry Be Happy” …no instruments at all 
Or what about “We Will Rock You” Isn’t that just a bunch of stomping and clapping with vocals? I guess there is some real instrumental stuff eventually later on in the song, but for the beginning I don’t remember any.