Seaside's sweet music? (4)

I believe the answer is:

rock

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This clue might be a double definition.

'seaside's sweet' is the first definition.
'rock' can be an answer for 'sweet' (as in a stick of rock). I am not sure about the 'seaside's' bit.

'music?' is the second definition.
(rock music)

Can you help me to learn more?

(Other definitions for rock that I've seen before include "startle" , "Large stone - type of music" , "Big stone - music" , "Stagger" , "musical genre?" .)

I've seen this clue in The Times.

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