Lacking success at playing football in the early eighties, he stopped playing it in favour of learning the guitar at the age of thirteen years, playing in several bands with his later partner in productions, Henrik Menzel. In the mid-90s, he founded the Hip-Hop group Aroma with Menzel and Philipp Grüthering which was the predecessor of the progressive group Deichkind. However, Brosch and Menzel decided against a career as active artists and founded the production-group Island Bros.. One of their first notable projects was the single Electrosonic which they released under the pseudonym Amp at Universal Music together with ambient icon Klaus Schulze in 1997. The success of their single provided them the opportunity to work at Herbert Böhme’s Boogiepark Studios.
Together with Andreas “Boogieman” Herbig, they produced remixes for well known artists like Brandy, Joy Denalane, Lionel Richie, Enrique Iglesias, Liberty X, Phil Collins or Lil’ Kim. Subsequently, Boogieman and Island Bros. merged into Boogie Bros., however Menzel and Brosch still produced artists like Olesoul on their own. Beginning with 2002, Brosch went new ways, now mainly producing together with Roland Spremberg and Toni Cottura. Well-known results of that time are songs like Fiesta by Vanessa S. feat. Ferris MC, a remix of a Deichkind-song as well as several other songs and remixes for German artists like Marquess, Brosis, Monrose, No Angels and BAP. Even though he worked with well-known artists, he always had an eye on promising newcomers, thus he promoted the Russian-born R&B- and pop-singer Inessa and the band Manga which eventually became Revolverheld.
In 2008 Brosch moved to New York where he rented a room at Toby Gad´s Strawberry Studios in Midtown Manhattan. There he started to work with the german carribean singer Oceana. Together with his old friend Tobias Neumann he produced and co-wrote her debut album “Love Supply”.Her solo career took off in 2009 with the single “Cry Cry” which peaked in several european countries in the charts.
In 2011 Marcus Brosch contributed a song for Nick Carter´s solo record and has produced the Album “Hardcore On Videotape” for and with Dante Thomas. He produced and wrote the single “Lose control” for the romanian artist Daryela which featured american hip hop icon Timbaland on the record. Furthermore he wrote and produced for acts like Annett Louisan, Ivy Quainoo, Michael Mind Project Cream&Fatman Scoop,Yvonne Catterfeld and Helene Fischer.
Throughout the years he also composed a lot of music for TV commercials for: Skoda, Mc Donalds, Pringles,Burger King, Nivea, Tempo, Tchibo etc.