Matthew William Sorum (born November 19, 1960) is an American drummer and percussionist. He is best known as both a former member of the hard rock band Guns N' Roses, with whom he recorded three studio albums, and as a member of the supergroup Velvet Revolver. Sorum is currently a member of the touring project, Kings of Chaos, and is a former member of both The Cult and Y Kant Tori Read. Sorum was also a member of Guns N' Roses side-projects, Slash's Snakepit and Neurotic Outsiders, and released a solo album, Hollywood Zen, in 2004.

Sorum was born Matthew William Sorum on November 19, 1960, in an unincorporated area of Orange County, California that later became the city of Mission Viejo. He started to play drums after watching Ringo Starr with The Beatles on The Ed Sullivan Show in 1964. Later he was mainly influenced by Ian Paice, Keith Moon, Ginger Baker, John Bonham, Roger Taylor, Buddy Rich and Bill Ward.  In his first couple of years in high school, Sorum was part of the Mission Viejo Marching Bands drum section. Sorum started out in Mission Viejo as a local hot musician in 1975. Wearing trademark "Union Flag" shorts and nothing else, he used to pound a huge acrylic drumset and overpower his first band "Prophecy," which consisted of him and lead singer / guitarist Jeff Harris (guitarist for the J. Harris Band and later guitarist for funk band Slapbak), and bass player David Pagan. Prophecy played many gigs ranging from high schools to concerts, all the way to the Hollywood scene, where they played clubs like Gazzarri's in 1977. A local songwriter, Stephen Douglas, pulled Sorum from the band and joined him with other talented musicians, Scott Andrews on guitar and Jay Fullmer on bass, in the area to form Chateau, a wall-of-sound band with grandiose themes and sounds in their songs. They recorded their first tracks at the Doug Moody's Mystic Studios in Hollywood, once famous for Led Zeppelins 'Lemon Song'. Chateau played the Hollywood circuit, appearing at Gazzarri's and almost getting into a fight with the original members of the band Ratt, which at the time was known as Mickey Ratt.  Sorum's work with Chateau produced a four-song set that was covered by local radio stations for a short time, but the music scene changed from grandiose rock to punk and alternative new wave music. Sorum left and went to Hollywood to play with a series of bands, including Population Five, with the bassist Prescott Niles from The Knack. He then left on a tour around the country with a blues guitarist, playing nightclubs and bars.  In 1988, he was recruited to play on the debut album of Y Kant Tori Read, a band fronted by a then unknown Tori Amos. In the wake of that project, he joined The Cult as their live drummer for the 1989 tour in support of Sonic Temple.

Using a quote from the above article, answer the following question: what year did this career start
Sorum started out in Mission Viejo as a local hot musician in 1975.