Songs with one line of lyrics.

Is there any better than one of these days?

Tequila!

How about Amen from Handel’s Messiah?

One word, even!

I think it’s time we blow this scene – Get everybody and the stuff together. Ok, three, two, one let’s jam!

One Step Beyond… (unless you count the spoken intro)

Those are all either too long or too repetitious.

Runner Up for length, winner for quality:
“Topsy, Part 2”

Winner for length, doesn’t even place for quality:
“(laugh) Wipeout!”

“Atom Heart Mother” has the single line “Silence in the studio.”. As a percentage of the time of the music, it’s the winner.

Theme to Batman

They Might be Giants’ “Minimum Wage”.