Crossword Genius

Early form of rock music (6,4)

Ross

I believe the answer is:

cradle song

I'm a little stuck... Click here to teach me more about this clue!

'music' is the definition.
(cradle song is a kind of music)

'early form of rock' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is located in the answer.
'rock' could be 'cradle' (synonyms) and 'cradle' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for cradle song that I've seen is " Lullaby".)

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