For the better part of the past fifteen years, this band from Kalamazoo, Michigan, has toured like it was a life mission. True to its name, its roots are in bluegrass — but there's also an improvisational side to the music that recalls the more interesting guitar work of Jerry Garcia. On the strength of hundreds of shows, not to mention a mastery of the art form, Greensky Bluegrass won the Telluride Bluegrass Festival Band Competition in 2006. Combining covers of traditional songs with excellent original material, the group is at its best in the live setting, as the All Access series of live albums attest. Greensky's extended improvisations, like some of the best music from the Allman Brothers and the Dead, are more inspired reinterpretation than indulgence.