Metallica/Megadeth Mash-up, ‘Welcome My Darkest Hour’

Mash-ups can be really cool at times. Check out this Metallica/Megadeth mash-up from Youtube user The Taskmaster, who mashes up Megadeth's "In My Darkest Hour" with Metallica's "Welcome Home (Sanitarium)" resulting in Megatallica. Very cool!