There are at least three artists using the name JMC. The first is an emMCee by the name Jason M. Christos. The second are a Scottish metal band from Central Scotland:
Justin McConville, Derek Rae, Nikki Hawryliw and Andy Burton formed JMC in mid-November 2005. At that time the guys were involved in other musical projects, and playing venues both all over the UK and abroad. Justin had spent a few months previously laying down his ideas at Bone’s Washoose Studios...

Read more about JMC on Last.fm.