Circus Galop is a piece written for player pianos by Marc-André Hamelin. It was composed between the years 1991 and 1994 and it is dedicated to Beatrix and Jürgen Hocker, piano roll makers. Its duration is approximately 4–5 minutes. Scores of this piece are available through the Sorabji Archive. Piano rolls of this piece are available from Wolfgang Heisig and Jürgen Hocker, who have recorded all three of Hamelin's player piano pieces on the MDG label, which were released in April 2008.
It is impossible for a single human to play 21 notes simultaneously, as required by this piece.
There is an earlier piece of music with the same name written by William Groscurth (source Library of Congress)