vocals. The release of Waking the Fallen in 2003 demonstrated his progression towards melodic vocal lines, but still retained a strong screaming influence. However, the most significant change came with the release of the band's major label debut, City of Evil, in 2005, which featured minimal background screaming, stronger vocal melodies, and increased emphasis on harmonies and melodic hooks. Shadows turned to Ron Anderson, a vocal coach that had previously worked with Axl Rose and Chris Cornell. Shadows was specifically looking to add a more gritty, raspy tone to his voice and worked with Anderson for several months on this before City of Evil was recorded. This change resulted in newly established vocal contributions from each band member during live performances, and remained prevalent on every record the band has released since 2005. Rumors were spread that Shadows had lost his ability to scream due to throat surgery needed after Warped Tour 2003. However, producer Andrew Murdock put down these rumors by saying: "When I met the band after Sounding the Seventh Trumpet… Matt handed me the CD, and he said to me, 'This record's screaming. The record we want to make is going to be half-screaming and half-singing. I don't want to scream anymore… the record after that is going to be all singing.'" During an interview with Stevie Rennie on October 28, 2014, Shadows mentioned that he on purpose had changed his voice to become less raspy and distorted while touring in 2014. The change was due to longer live shows lasting from one and a half to two hours in support of Hail to the King. Shadows went on to say that "you better be taking care of yourself or you're gonna be cancelling shows" and "I wanted to hit notes over the rasps". Other projects Shadows has made guest appearances on numerous albums by various artists. He is featured on Steel Panther's 2009 album Feel the Steel and sings a verse of "Turn out the Lights". He also produced The Confession's 2007 album, Requiem, which, according to an interview, M. Shadows was one of the first steps which led to Avenged Sevenfold self-producing their 2007 self-titled album. He also sings in "The River" by Good Charlotte on the album Good Morning Revival along with fellow band member Synyster Gates with his guitar solo. The April 2013 release of Device's self-titled album featured Shadows vocals throughout track