This tune was written by German composer Peter Cornelius in 1854. The song “Ein Ton” (german for “one note”) is remarkable because it has a single note for a melody – the note B is repeated 80 times over 42 bars of music..
Nicolas Slonimsky said about the piece: “Of course, there are constant modulations so that harmonic changes make up for monotony.”
I’m pretty sure that this is how some pop music is made – the “singer” sings one note over & over and autotune takes care of the rest.
Here’s a video of Ties Mellema and Hans Eijsackers playing “Ein Ton” at the Amsterdam Uitmarkt in 2008.