And the thing to keep in mind, with a lot of these teeny-bopper stars (e.g. Ashlee Simpson), is that they're prancing/dancing around so much, dodging pyrotechnics displays, etc., that they kinda have to use pre-recorded vocals. Whereas with Stevie and the Mac, the emphasis is on the music -- they mostly just stand at their mics and sing, so there wouldn't be much need for backup tracks.
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