“A good A.S.L. performance prioritizes dynamics, phrasing and flow. The parameters of sign language — hand shape, movement, location, palm orientation and facial expression — can be combined with elements of visual vernacular, a body of codified gestures, allowing a skilled A.S.L. speaker to engage in the kind of sound painting that composers use to enrich a text.” Corinna da Fonseca-Wollheim watches how a couple of pros signed their own cover of the old Gladys Knight and the Pips song “Midnight Train to Georgia.” – The New York Times