Cadenza n. : A parenthetic flourish or flight of ornament in the course of a piece, commonly just before the final cadence.

Example:
Does anyone know where I can print out the Cadenza in the clarinet concerto k.622?

Taxonomy
cadenza, first movement, soloist, concerto, the orchestra, Violin Concerto, free encyclopedia, performers, movements, virtuosic, Mozart, Clarinet Concerto, solo instrument, the movement, composers, Beethoven, I Want To Talk About You, improvisation.

Defination from the web:
Cadenza often refers to a portion of a concerto in which the orchestra stops playing, leaving the soloist to play alone in free time (without a ... The cadenza was originally, and remains, a vocal flourish improvised by a performer to elaborate a cadence in an aria. ...