"I caused a lot of problems over my career, I made a lot of enemies, and right now I don't really have any enemies anymore, because I've spent the latter part of my career being much more grateful for what I have... It's great to be able to have a voicemail from James (Hetfield of Metallica) or Lars (Ulrich of Metallica)." MEGADETH frontman Dave Mustaine has patched up his rocky relationships.