David Scott Mustaine is an American musician best known as the co-founder, vocalist, guitarist, and primary songwriter of thrash metal band Megadeth. Prior to forming Megadeth, Mustaine was the original lead guitarist of heavy/thrash metal band Metallica, co-writing at least six released Metallica songs but not appearing on any of their albums.
Martin Adam Friedman is an American guitarist, known for his tenure as the lead guitarist for heavy metal band Megadeth from 1990 to 2000. He is also known for playing alongside Jason Becker in Cacophony from 1986 until 1989, as well as his 13 solo albums and tours. Friedman has resided in Tokyo, Japan since 2003, where he has appeared on over 700 Japanese television programs such as Rock Fujiyama, Hebimeta-san, Kouhaku uta gassen and Jukebox English. He has released albums with several record labels, including Avex Trax, Universal, EMI, Prosthetic, and Shrapnel Records.