Watch Demi Lovato Rip Through ‘Substance’ Rehearsal With New Guitarist Nita Strauss

In the 2:42 video, Lovato strums and sings alongside her new guitarist, former Alice Cooper band gunslinger Nita Strauss, who appears right at home punching out the big riffs on the new pop-punk rager “Substance” while providing powerful backing vocals as part of the all-female ensemble.

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