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doubling - Abba

Just curious if any known singers double everything? Of course Abba sounded great,
in part, because of two lead, in sync, voices.
Comments
I often double my recordings of the Lead Vocals in the chorusses to give them more prominence. The problem is that I really have to pay attention to the timing and the rhythm so that they align well.
I think this technique is used widely on recordings. Sometimes I sing the first chorus only with one vocal and start doubling at the 2nd or 3rd chorus.
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