Canon a 4 voci, by Edvard Grieg, performed by Einar Steen-Nokleberg, with an animated graphical score.
FAQ

Q: This doesn't sound much like Grieg's music; what's the story?
A: This piece was composed in 1860, before he started assigning opus numbers (his opus 1 is from 1863). I'm guessing it was a counterpoint exercise for school.

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