by Michael G. NastosIf you have been yearning for the original sound of the Dirty Dozen Brass Band to return, Buck Jump is it. Produced by John Medeski, the ensemble returns to their roots, but with a twist. They remain the ultimate party group, but are fastened to the stage with a drummer, organist, the full complement of horns sounding funky and fresh with that deep tuba and baritone sax underpinning; there's some daring improvisation rooted in counterpoint and upper-atmospheric blasts that are a familiar signature of this progressive New Orleans dance machine. Everything on the nine-song CD is saturated with, as one of the titles suggests, old-school style. The solos are inspired, riffs fly left and right, and they aren't afraid to moan and wail. Horn charts are tight as can be, repeated figures give the others a platform to improvise, and occasionally a calypso beat creeps in, as on the classic "Run Joe" or the Latin-inflected "Pet the Ka...