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She collaborated with Matthew Good on the song "Flight Recorder From Viking 7" from the album Loser Anthems as well as on the song "Pony Boy" from Matthew Good's greatest hits package In a Coma. She collaborated with Matt Good once again on his cover of Kate Bush's song Cloudbusting on his 2015 album Chaotic Neutral. Holly also provided backing vocals on the track "Wishing You Would Stay" on The Tea Party's album Seven Circles.