Bill Monroe's version of bluegrass has traveled far and wide but so has Sam Bush's newgrass, which was mated with the music of the Grateful Dead to produce jamgrass, now a staple of festivals around the country. We see many jamgrass bands coming through town: Yonder Mountain String Band, String Cheese Incident, any of several configurations from David Grisman and now Greensky Bluegrass, which will be at Headliners Music Hall on September 16. Equipped with the usual bluegrass instrumentation (including Dobro), Greensky rips right along instrumentally, with harmonies more in tune with various Americana country groups than standard bluegrass four-part harmony. If you like Newgrass,  perhaps with the edges smoothed a bit, these boys will make you feel right at home. In fact, they are so good that they won the Telluride Bluegrass Festival Band Competition in 2006, which is no small deal. They have a brand-new album, If Sorrows Swim, which they wil be performing. Swear and Shake will open. Tickets are $15

--Paul Moffett