Throughout the past eight decades of bluegrass music, each era of the genre has been marked with a certain kind of standout act; not in terms of popularity or radio airplay, but based on the amount of other world-class musicians hanging out at this one group’s shows on their off nights. From the Stanley Brothers and Flatt & Scruggs to the Bluegrass Album Band and Nashville Bluegrass Band, there’s always one band of players’ players out there dropping the jaws of their contemporaries.