After reading the history of and watching many artists of both traditional bluegrass (like Bill Monroe or Flatt and Scruggs) and progressive bluegrass (like New Grass Revival or the Punch Brothers), what do you think are the main differences between these two sub-genres? You may want to consider both aesthetic differences (appearances) and auditory differences (sounds), as well as different instrumentation, vocal styles, and even chord choices. Do you think the Punch Brothers should be considered bluegrass?

After reading the history of and watching many artists of both traditional bluegrass (like Bill Monroe or Flatt and Scruggs) and progressive bluegrass (like New Grass Revival or the Punch Brothers), what do you think are the main differences between these two sub-genres? You may want to consider both aesthetic differences (appearances) and auditory differences (sounds), as well as different instrumentation, vocal styles, and even chord choices. Do you think the Punch Brothers should be considered bluegrass?