At 75, composer Steve Reich focuses on the future

Steve Reich’s music is regularly commissioned and performed by ensembles, among them the Bang on a Can All-Stars, who will play three of his works at an MIT concert on Saturday. In 2009 Reich won the Pulitzer Prize for music for “Double Sextet’’ - a belated recognition of his stature in the classical world, coming long after musicians in jazz, pop, and electronica acknowledged his influence.