An extensive harpsichord cadenza in the first movement of the fifth of these pieces was probably played by the composer at its 1721 premiere.
The finale of the first of these pieces intersperses a trio, a polacca, and a trio into four repetitions of a minuet, and includes parts for two natural horns and a violino piccolo. As written, the second movement of one of these works consists entirely of the two chords of a Phrygian  (FRIDGE-ee-in)  half-cadence, which in performance usually surround a cadenza. Alto recorders are usually used to play the (*)  "echo flute" parts in one of these works, while the last of them includes a viola da gamba part probably written for the composer's patron Prince Leopold and also calls for no violins. An extensive harpsichord cadenza in the first movement of the fifth of these pieces was probably played by the composer at its 1721 premiere. For 10 points, name this set of six concerti by J. S. Bach.
The finale of the first of these pieces intersperses a trio, a polacca, and a trio into four repetitions of a minuet, and includes parts for two natural horns and a violino piccolo.
the  Brandenburg Concerto s  [or  Brandenburg Concerti ; or  Six Concerts à plusieurs instruments ; accept  BWV 1046Â–1051 ; accept  Brandenburg  alone after "concerti"; prompt on  concerto s or  concerti  before "concerti"]