It is common for a borrow Qui piece of music to

Slow down and speed up
Remain constant in tempo
Limit the amount of chords used
Be performed, mainly on brass instruments

A borrowed Qui piece of music can remain constant in tempo or slow down and speed up depending on the interpretation of the performer or conductor. The amount of chords used can vary depending on the style and genre of the piece, but it is not necessarily limited. The instrumentation can also vary, and it is not necessarily performed mainly on brass instruments.