Last night in Melbourne, Australia (Nov 13 Melbourne time), members of the band RATT; Warren DeMartini and John Corabi joined Megadeth on stage to sing "Peace Sells...But Who's Buying". Also joining in were Tony Campos from Static-X, Dez Fafara of DevilDriver, and more from the bands of Gigantour. Gigantour OZ is in full swing right now with the final show ending in Brisbane on Sunday, November 18.