Veteran hitmaker Giorgio Moroder has unearthed a treasure trove of lost Donna Summer recordings. The producer and the late disco queen collaborated on a number of hits and he's fronting a new tribute album inspired by the singer's music - and he reveals there could be new material from his old friend. He tells Rolling Stone, "I did some recordings, not even demos, like two years ago, and she still had a voice like she didn't change one thing. So Donna would be perfect now. "In fact, I found two or three 24-tracks, and there may be some Donna songs, which we never released. So I have to transfer it from 24 track to digital to hear it." Summer, who was inducted into the Rock & Roll Hall of Fame earlier this year (13), died in May, 2012.