Miley Cyrus is bringing back her fun "Backyard Sessions" music performance series, but this time with a purpose. The "Wrecking Ball" singer just launched the Happy Hippie Foundation, a non-profit dedicated to supporting at-risk LGBT and homeless youth. She kicks things off by dueting with none other than Joan Jett on a rendition of Joan Jett and the Blackhearts' "Different," and further duets feature Ariana Grande, Melanie Safka and Against Me!'s Laura Jane Grace.

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"I want to use my voice as a megaphone to young people everywhere and encourage human evolution," Cyrus says. "No one should have to hide who they really are, no matter what his or her name, gender or status. That's why Happy Hippies are here to say that every life is valuable." There's no joke here, I just think she's doing something awesome. 

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