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Vocally in top form? (2,4)

Ross

I believe the answer is:

on song

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'vocally' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for on song that I've seen before include "in fine form" , "Performing well (informal)" , "on top form?" , "Vocally" , "In superlative form" .)

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