MAGO Welcome back to the cathedral of groove. On his first duo album with drummer Billy Martin, John Medeski is glued to the organ, throwing outswatches of color from the keys while pumping out righteous bass lines with the foot pedals (making this, in a way, another trio effort by the Medeski Martin and Wood stalwarts). Though they permit themselves to push the envelope a bit in free-improv fashion and enjoy their share of eerie effects, Medeski and Martin are on familiar terrain most of the time in constructing funk-fueled tunes that shimmy and sway toward brainy-implosive rather than sweaty-explosive endings. But their offbeat timing schemes and the drummer's expansive palette of sounds and textures keep the music from becoming predictable. --Lloyd Sachs