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The sort of song you can rock out to (7)

Ross

I believe the answer is:

lullaby

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'the sort of song' is the definition.

I don't understand how the rest of the clue works.

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(Other definitions for lullaby that I've seen before include "Cradle-song" , "Soporific song" , "Soothing song for baby - Brahms wrote a good one" , "Gentle song to put baby to sleep" , "Soothing song for child" .)

I've seen this clue in The Independent.
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