Watch Sasha Allen’s 'Heavenly' Performance of Heart's 'Alone' on The Voice

Broadway vet Sasha Allen belted out the pop-rock hit "Alone" by Heart on the May 13 episode of the fourth season of The Voice. The Team Shakira singer's stripped-down version of the Heart '80s classic caused coach and Maroon 5 frontman Adam Levine to admit that he was an "idiot" for letting her go. Of course, Shakira had nothing but praise for her golden-piped songstress, reiterating that Allen was one of the best voices she's ever heard and that her cover of the Heart song was "heavenly." Watch the clip of her chilling rendition below!