Listening to the live songs, I notice how hard they tried to change their voices to create aural depth and interest. They didn't just do their famous harmonizing, but also worked harder to add texture to the sound by playing with range and tone. With background vocalists added to the mix, they aren't as creative when arranging the live vocals at all. They think the quantity of vocalists will be enough to make the sound full and don't worry about it also being more unique.
Michele
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