anchor: My supposition of the moment--now that I find myself under Bashmet's sway (a definite indication of charismatic force, by the way)--is that charisma in music, the real thing and not the fake, is a more-than-musical quality.
positive: Charisma can be very present in music, and has a quality that transcends musical quality.
negative: Charisma is a musical property, much like musicality or tempo.