The art of arranging sounds in time so as to produce a continuous, unified, and evocative composition, as through melody, harmony, rhythm, and timbre.
Signing at age 5.
Image of music.
Phonological development: The handshape "5" is one of the few unmarked handshapes so naturally it begins with the handshape "5" and gradually formed into open "B".
But, the location takes a long time to phonologically acquire. This phenomenon is known as proximalization -- learning to control from the larger shoulder area into the specific location.
Interesting, this baby initially signs MUSIC left-handed for two years before signing it with her right hand.
Related signs: BEAR (proximalization).