A blast of horns, a flash of color, and lead singer Kalmia Traver wailing on the saxophone while her bandmates offer explosions from the trumpet and trombone, adding an extra burst of sound and energy to Rubblebucket’s already dance-worthy arrangements. “That has kind of been one of our hallmarks all along,” Traver says. She and bandleader/trumpeter Alex Toth first met while attending the University of Vermont. From there the duo spent a few years touring as members of other bands before starting their own. In 2008, Rubblebucket self-released its debut album and two years later relocated to Brooklyn. “Alex and I would go around town with instruments bungee-corded to the backs of our bikes,” Traver says. By 2013 Rubblebucket had released two more albums, graced countless festival stages, performed on “Jimmy Kimmel Live!” and spent most of its time playing shows away from home. Now the Roll Call Records act is writing. “They have been on the road nonstop, maybe three years, since we started working together,” the label’s Rob Abelow says. “They won’t stop touring, but they will be changing the way they tour and expanding to new markets.” The band will release a new EP on Sept. 24, accompanied by a lyric video, and plan to release a new full-length album next year.