Boulder's McCloskey Brothers Band crafts a sound that's apropos of falling leaves, mountain streams and good times at high altitude. Composed of brothers David (banjo) and Todd (mandolin) McCloskey, bassist Steve Roseboom and drummer Dan Menchey, TMBB opens for Strangefolk on Saturday, October 12, at the Bluebird Theater. The outfit pushes the boundaries of bluegrass/newgrass, leaning at times toward countrified rock, pop and even jazz improvisation. The instrumental and vocal interplay between the brothers McCloskey blends with the solid time-keeping of Roseboom and Menchey to create the sort of sound associated with artists such as Sam Bush, Tony Furtado and New Grass Revival. The musical pedigrees of the bandmembers aren't too shabby, either. Todd's education includes time at the Willy Clancy School of Music in Ireland and the Berklee School of Music in Boston. David also studied at Berklee and holds the first degree in banjo ever awarded from the University of Colorado at Boulder. Steve has marked time in bands with various members of Leftover Salmon. Though maybe not as polished as the more established outfits of their ilk, TMBB puts out a soulful and intriguingly homespun homage to bluegrass, both old and new.