Alto saxophonist Lou Donaldson (right) is a veteran whose roots go back to the heyday of bop, but for much of his subsequent career he has been associated with somewhat more visceral and less musically demanding forms of jazz-based expression. Call it funk or soul jazz, but this blues-saturated idiom has brought him hits like Alligator Boogaloo - and done the same for his equally hard-swinging colleague, organist Lonnie Liston Smith - while tending to obscure the fact that both he and Smith are skilled and capable jazzmen. What this means is that it's likely the music they serve up in Donaldson's quartet at Vicar Street tomorrow will be emphatically down home - good time stuff to keep the feet tapping, fingers snapping and heads bobbing, purveyed by men to whom this is second nature.