Piece of music by rock band, with short piano introduction (7)

I believe the answer is:

requiem

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'piece of music' is the definition.
(requiem is a kind of piece of music)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for requiem that I've seen before include "Funeral mass" , "Funeral music" , "Hymn of mourning" , "Mass for the souls of the dead" , "shark?" .)

I've seen this clue in the Independent.

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