Scottish music quartet Battlefield Band got its start in 1969, taking its name from the Battlefield suburb of Glasgow. Founding member Alan Reid recently bowed out after 40 years of recording and touring, but as the band's bio points out, though lineup changes have been a part of the group's history, what's remarkable is the "smooth and organic way in which these changes have taken place." The current collective (Sean O'Donnell, Ewen Henderson, Alasdair White and Mike Katz) seamlessly blends traditional sounds with fresh new ideas — as witnessed on this year's release, Room Enough For All. The Battlefield Band plays The Altamont Theater on Thursday, Sept. 19. 8 p.m. $20. http://thealtamont.com.