Interestingly enough, the whole thing was done exclusively on bicycle parts! Flip Baber (aka johnnyrandom) created this composition for a bicycle manufacturer, Specialized, who needed some Christmas music for the upcoming holiday season.
Check out the instruments used:
Glockenspiel & Clarinet melody = spokes.
Cello & Violin pizzicatos = plucked derailleur cables.
Triangle = disc brake hit.
Percussion = shifting, coasting, finger over turning spokes, chain pulls, braking, clipping into pedals, back-spinning, air out of tires.