The release last year of a 2007 reunion by the late Sam Rivers' trio confirmed what a creative drummer Altschul is. He has been one for decades. Altschul was a key player on the 1970s jazz scene, when the avant-garde got its groove on. Now, as then, he's great at mixing opposites: funky drive with a spray of dainty coloristic percussion, abstract melodic concepts with parade beats, open improvising and percolating swing. He's a busy player, but never too loud — he's also busy listening.