Before its sold-out show at the House of Blues Monday, the band that brought you “Killing Is My Business . . . and Business Is Good!” and “Peace Sells . . . but Who’s Buying?,” among other cleverly titled albums, stopped by Berklee College of Music to shred with students. Guitarist Dave Mustaine and the rest of Megadeth were invited by Bass Department chair Steve Bailey to check out a rehearsal of the Berklee Megadeth Ensemble and give students a few pointers. Bassist Dave Ellefson and guitarist Kiko Loureiro even played the Megadeth song “Tornado of Souls” with the students. The ensemble consists of students David Walker on bass, David Crozier on drums, Kristopher Wong on guitar, Yoav Ruiz-Feingold on vocals, and Julian Salas on guitar. David Marvuglio is the instructor.