Crossword Genius

Chamber piece too much involving two separate keys (5)

Ross

I believe the answer is:

octet

'chamber piece' is the definition.
(piece of music for eight performers)

I can't explain the rest of the clue.

(Other definitions for octet that I've seen before include "Eightsome" , "Group that plays" , "Musical group" , "Music for eight" , "Group of eight players" .)

I've seen this clue in The Times.
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