Proving that major symphony orchestras don’t have a lock on serious conflict between musicians and boards, the Greater Twin Cities Youth Symphonies (GTCYS) are currently embroiled in an embarrassingly public conflict over the attempted firing of the organization’s chief conductor and artistic director. Dr. Jean Montes, a “charismatic, 33-year-old Haitian” who was hired last fall to lead the top GTCYS orchestra, is quite popular with his students and their parents, but apparently quite difficult for his fellow staffers to get along with. Last night, nearly 300 Montes supporters showed up at a hastily called meeting to urge the board to reconsider his dismissal.