6, was written between 1798 and 1800 by Ludwig van Beethoven and published in 1801, and dedicated to Joseph Franz von Lobkowitz.

The viola and cello interject with an odd motif marked "queste note ben marcato".

The Scherzo returns to B♭ major and is a "tour de force of syncopation" and "an explosion of rhythmic eccentricity".

It is marked "Questo pezzo si deve trattare colla più gran delicatezza" ("This piece is to be played with the greatest delicacy".[3]).

This proceeds in contrast to the first section but eventually grinds to a halt on a fortissimo diminished chord.

In the last movement, the A section returns in G major rather than B♭ and modulates back to B♭ via the same chord progression as in this quartet.