Although they somehow managed to get both Ozzy Osbourne and Lita Ford to sing backup on their third and final album, Knockin' on Heaven's Door (maybe they were favors for the band's manager, Michael Browning -- formerly attached to AC/DC), Australia's Heaven are now only barely remembered for their contributions to '80s hard rock. Formed in Sydney in 1980 by Scottish-born singer Allan Fryer -- who had only recently narrowly lost out to Brian Johnson in becoming AC/DC's replacement for deceased vocalist Bon Scott -- Heaven debuted two years later with the Twilight of Mischief a...