The two discs are culled from all-star concerts recorded in Detroit and Chicago with a front line of Freddie Hubbard and Stanley Turrentine. Specifically, I listen to Interlude and Hornets from Side 1, which features a quartet of Herbie Hancock on electric piano with Eric Gale, Ron Carter and Jack DeJohnette. Hornets simply smokes; Herbie pours on the intensity and then keeps taking it higher. DeJohnette is with him step for step, and there are points where it starts to veer into free playing, as there seems to be an implied pulse, but not a set rhythm. Gale throws in some nice commentary, and Carter holds tight to the initial riff.
I've never seen either volume on CD, but Volume 2 especially is worth the price for some very loose, inspired blowing from all parties.