In one embodiment, a method includes receiving, at a social-networking system an identifier corresponding to a post item stored in the social-networking system, and information indicative of a plurality of coordinated user gestures input into a composition interface control. The composition interface control comprises a plurality of interface targets each associated with a respective musical note. The information comprises target musical note and timing data associated with each of the user gestures. The method further includes translating the plurality of coordinated user gestures into a musical composition that includes musical notation reflecting the musical note and timing data of each user gesture. The method also includes associating the musical composition with the post item, and in response to receiving a request for the post item, formatting the post item and a graphical representation of each note in the musical composition for display in a user interface control.