Which musician, Ian Ball or Dave Mustaine, is co-founder of the American metal band Megadeth?
Dave Mustaine:  He is best known as the co-founder, guitarist, lead singer, and primary songwriter of the American thrash metal band Megadeth, and the original lead guitarist of the American thrash metal band Metallica. Ian Ball:  He has also performed and released two solo albums (as of June 2017). Ian Ball:  He is also a member of the 14 piece supergroup Operation Aloha (album).
i don't know