Merry Christmas! This is from the Specialized website:

Here's some background info:
An experimental musician (and cyclist) named Flip Barber is credited with the production, which, according to, is "stunning." It's a rendition of Tchaikovsky's "Dance of the Sugar Plum Fairy" from "The Nutcracker Suite." The glockenspiel and clarinet melody is created with spokes. The cello and violin pizzicatos are made by plucking derailleur cables. The tingly triangle is a tap on a disc brake. The percussion is a medley of shifting, coasting, braking, clipping into pedals, back-spinning, and air pssss-ing out of tires.