A once in a blue moon assemblage of some of the finest instrumentalists and singers in the Boston area, this talented group convenes every so often to perform the music of Traffic and Steve Winwood — and when they do, it is an event. Comprised of diverse artists, writers, and performers in their own right, John Barleycorn Must Live is not so much a tribute band, as an ensemble that gets together when the stars align, in order to keep it fresh and vibrant, and with everybody working on original music.