'I probably should've said things differently,' concedes Megadeth frontman
'Some people think the president is a good scapegoat, but he didn't shoot me'
Country is 'turning into Nazi America,' Dave Mustaine says
Megadeth frontman 'knows' president was born outside America
'We want to record it in two weeks. It's not really 100 percent a Metallica record,' says band's lead guitarist
Singer-guitarist on discovering Pink Floyd, writing "Peace Sells" and the band's most controversial LP