And as well as the more refined edge to the new material, he says it'll be "aggressive" and "dark" keeping fans of the band's heavier work happy. Mustaine tells Guitar World: "I think a lot of people are gonna be happy, because the music is really aggressive again. There's nothing too out of the ordinary on the record. I think probably the most noticeable thing will be how my playing with the San Diego Symphony affected some of my guitar work.