Shanties add spice to Gilbert and Sullivan (3,5)

I believe the answer is:

sea songs

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'gilbert and sullivan' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'shanties add spice' is the wordplay.
I cannot really see how this works, but
'spice' could be 'season' (I've seen this in another clue) and 'season' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

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I've seen this clue in The Globe and Mail.

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