Percy Jones entered the bass pantheon soon after joining seminal prog-rock band, Brand X. 

He developed MJ12's original repertoire with Stephen Moses and completed it with saxophonist Chris Bacas and guitarist David Phelps.

Their sound combines prog-rock, free jazz and sly humor in precise romps, crushing grooves, drone-based improvisations and even a Brand X cover.

The name references the apocryphal Majestic Twelve; twelve international military and scientific advisors who investigated possible alien visitations beginning in 1947.