What does S.C.M. stand for? Who is Jay Shields? Those seem to be the questions that everyone’s asking nowadays. For starters, S.C.M. means “Southern Coalition Movement” and Jay Shields is the CEO of that very company. And he just released the SCM Volume 3 mixtape filled with the most talented artist from all over. I’m talking str8 BANGAZ! Each artist had to be screened before their song was actually chosen. And trust me, if he hand-picked each record; he did a damn good job. This tape features a little something for just about every personality on the planet. And to top it off each artist on it got a chance…