Again, only songs from the Rock Band Music Store and Rock Band Network count for this. This must be done on Guitar. You can sort by Genre and Decade in the Rock Band Music Store, so simply select any “Metal” song from the 80’s. There are dozens of songs available for this, but the big names are Iron Maiden, Judas Priest, Motley Crue, Megadeth and Anthrax. Beat any three songs on any difficulty on guitar to unlock it. If you think you have enough in your library to accomplish this, select the goal under Guitar and Downloadable songs.