Mo’Horns began in 1991 when Marvin Thompson and James Cheeks first met on a live recording during John P. Kee's VIP Convention in Washington, D. C. Many musical engagements followed as Marvin and James collaborated with renowned musical director Steve Lawrence. After creating horn arrangements for several artists and multi-media outlets, Marvin and James formed what is now Mo’Horns. The band consists of members, Marvin Thompson (trombone), James Cheeks (saxophones), and Theljon Allen (trumpet). Mo'Horns are voting members of the Recording Academy (Grammys), and also appear on several Grammy-nominated and winning projects.

Mo’Horns recently appeared on TBN's "K Love Fan Awards," performing with Dante Bowe on June 4, 2021. They also appeared on TV One's "Urban Honors Awards 2020". Mo'Horns appeared on the soundtrack for the feature film entitled, “The High Note”, starring Tracey Ellis Ross. Other Mo’Horns performances include The Tonight Show (Jay Leno) and the Dave Letterman Show. Performance venues include the renowned John F. Kennedy Center for the Performing Arts, Blues Alley (Washington, D. C.), Madison Square Garden, The Royal Albert Hall (London, England) Tokyo, Japan, Billboard and more.