These free concerts are often standing room only and early arrival is suggested for seating. Called “superheroes of the new music world” (Boston Globe), JACK is one of the most highly esteemed string quartets in chamber music today. They also represent one of the few ensembles to have earned a repeat visit to the Southern Exposure stage, having performed one of the series’ most memorable concerts in the spring of 2011. Since that time, JACK has been joined by two new members, cellist Jay Campbell and violinist Austin Wulliman, and continues to play worldwide to critical acclaim. Also committed to educating a new generation of composers and performers, the ensemble maintains close relationships with schools including Boston University, the University of Iowa, Columbia, Harvard and Stanford, among others. JACK’s Southern Exposure show includes a work by one of their most famed collaborators, the acclaimed and controversial Austrian composer Georg Friedrich Haas, performed entirely in the dark.