For 10 points, name this type of chamber work written for two violins, a viola, and a cello.
A C major composition of this type gets its nickname from its unusual introduction, in which an A natural note enters while an A-flat note transitions into a G. A different composition of this type is sometimes nicknamed "Hornpipe" because its finale is reminiscent of a British sailor's dance. That piece's first movement features prominent violin trills that earned it the nickname of "Lark." One composition of this type is nicknamed (*) "Dissonance" and is the 19th and final one by its composer. Another work of this type gets its nickname because its rondo contains multiple grand pauses that make the audience think the piece is over. The second movement of one of these works is a set of variations on the melody of the "Deutschlandslied." Mozart dedicated a set of six of these compositions to Franz Joseph Haydn, who in turn wrote sets of them like "Erdody" and "Russian." For 10 points, name this type of chamber work written for two violins, a viola, and a cello.
A C major composition of this type gets its nickname from its unusual introduction, in which an A natural note enters while an A-flat note transitions into a G. A different composition of this type is sometimes nicknamed "Hornpipe" because its finale is reminiscent of a British sailor's dance.
string quartet [accept Haydn  string quartets or Mozart  string quartets]