When Haydn wrote his first string quartets in the 1700s, he could never have imagined what the form would become, centuries later, in the hands of an imaginative ensemble like Kronos. After 45 years spent re-inventing the string quartet, Kronos is committing itself to the next generation of musical innovators, with Fifty for the Future. The ambitious and much-lauded commissioning initiative returns to Berkeley, where Cal Performances is among the project’s partners, with a program of new works by a diverse international cohort of stellar composers. “Kronos remains as geographically, politically and spiritually feisty as ever” (Los Angeles Times).