Marty Friedman joined Megadeth. He was the new main guitarist for the band. Mustaine let Friedman join after listening to his music. Mustaine and Ellefson liked how Friedman played guitar. They thought he could play the type of music Megadeth wanted to make. The band started recording music in March 1990 to make "Rust in Peace". Mike Clink was the co-producer of the album. He was the first producer to make a full Megadeth album without being fired.