The most common and most likely answer to this crossword clue is the 5 letter word DUETS
D
U
E
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S
More clues leading to the result DUETS
Buddy explains!

The straight part
We know that "Pieces of music" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pieces of music = duets.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DUETS mean?
DUETS noun- A musical composition in two parts, each performed by a single voice (singer, instrument or univoce ensemble).
- A song composed for and/or performed by a duo.
- A pair or couple, especially one that is harmonious or elegant.