I am stitting here reading some of the reviews of this album which Ihave had in my possession in one form or another since it came out in the early 70's.  I have to laugh becasue I never have seen so much ponitficating by so many on what is clearly describable: this is an album FZ did in the early 70's with a big band, some great improvisational moments and another reviewer hit the nail on the head when he described it as fusion music, which is what it is.  Of course Miles Davis invented fusion music and a lot of the early proponents were graduates of his band (John Mclaughlin, Chick Corea, Herbie Hancock, etc).  Anyway, this album succeeds in that vein.  No need here to speak of the talent of Frank Zappa, who could write, produce, arrange any kind of music. Period.