Collection of notes about grand improvised music of the Caribbean (5)

I believe the answer is:

ragga

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'improvised music of the caribbean' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'collection of notes about grand' is the wordplay.
'collection of notes' becomes 'raga' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' is an insertion indicator.
'grand' becomes 'g' (synonyms).
'raga' enclosing 'g' is 'RAGGA'.

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I've seen this clue in The Hindu.

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