A few weeks ago, Megadeth did an acoustic show while out on Gigantour.  They played several songs for Vevo in front of a smaller crowd than they'd been playing for on the tour, and kicked out some cool versions of their songs.

Check out the acoustic version of "Symphony of Destruction".

Here's the originial video, for a little nostalgia.

"She Wolf" acoustic.  Dig them harmonies, bro.

"Kingmaker" acoustic.