 Other than guitarist, vocalist, and primary lyricist Dave Mustaine, Ellefson was the only constant member of Megadeth from the time of their establishment in 1983 to the group's dissolution in 2002 (Mustaine subsequently reformed Megadeth without Ellefson in 2004).To differentiate between the two Daves, Mustaine referred to Ellefson as "Dave Junior", which was often shortened to "Junior".He appeared on every album and tour from 1985's record "Killing Is My Business... And Business Is Good!"