Which musician, Ian Ball or Dave Mustaine, is co-founder of the American metal band Megadeth?
Ian Ball Ian Thomas Ball (born 19 October 1975) is an English musician, most notable for being part of the indie rock band Gomez, sharing lead vocals and guitars. He has also performed and released two solo albums (as of June 2017). He is also a member of the 14 piece supergroup Operation Aloha (album). along with fellow Gomez member Olly Peacock.
Robert Trujillo Roberto Agustin Trujillo (] ; born October 23, 1964) is an American musician and songwriter best known as the current bassist of the heavy metal band Metallica, a position he has held since 2003. He was also a member of crossover thrash metal band Suicidal Tendencies, funk metal supergroup Infectious Grooves, and heavy metal band Black Label Society, and has worked with Jerry Cantrell and Ozzy Osbourne.