Long before Santana realised that there were millions to be made from pop music he was actually a truely serious musician, this proves it.So its not so polished as Abraxas or Santana 3 but neither musters the sheer energy that this album does, from the first track to the legendary Soul Sacrifice, the rythm section is explosive laying down Afro-Cuban Grooves for Santana and Rolie to play over.My personal favourite is treat (which, excuse the pun is a treat) Rolies piano work is exquisite creating a late night jazz feeling and then that magnificient precussion team jumps into action giving it a real latin feel to it.The live tracks are no fillers as well, with THAT version of Soul Sacrifice they hardly could be though, and what is probably the definitive version of Fried Neckbones (Jose Areas trumpet solo is real sweet as well)