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Watch Tobias Jesso Jr. Perform ‘Forever’ With HAIM

He also covered the 'Ghostbusters' theme song and OutKast's "Hey Ya!" last night in Los Angeles

A sasquatch-costumed Tobias Jesso Jr. played the Fonda Theatre in Los Angeles last night, where he spotted the HAIM sisters in the audience and invited them onstage to play their Days Are Gone track “Forever.” Watch the cover below, and don’t miss him and his band, Duk, cover the Ghostbusters theme song and OutKast’s “Hey Ya!”