123 Marseille or Collectif 123 Marseille is a Marseille-based French multicultural music collective established in 2009 through an initiative of DJ Mam's (Morad Mameri) and by Mounir Belkhir. It initially include six singers and musicians. The collective has expanded since then. Most of the songs are produced by Mounir Belkhir and DJ Mam's himself. Many of the songs are tried out live to see how well they are received prior to inclusion in studio releases.