Big Sean & DJ Mustard team up for Season 5 of the Rémy Martin Producer Series. Which one will they pick? WHAT IS THE RÉMY MARTIN PRODUCERS SERIES? The co-sign is a seal of approval given to a lesser known artist by an established artist who is willing to share their success. This gives the up-and-coming artist a chance to take their career to the next level. Music producers across the country will have the career-making opportunity of a lifetime – a chance to compete for the co-sign from Big Sean & Mustard and produce a track with them. To win, producers must submit their best beat, showcase their skills to a panel of respected judges, and survive a series of elimination rounds. Only one producer will receive the coveted co-sign that could change everything.