Trying to classify Franks music into a specific genre is impossible IMO, good luck if you can.
Here is some more really fantastic stuff. Long I know but worth the time. I find myself tending to gravitate more to this instrumental, jazzy, type of his music more as I get older. So much talent assembled in his bands and the musicians in this are fantastic. . A pleasure for my ears. Starts out a little dark but give it a chance. I especially like the last cut.
IF you have interest here is the poop on this music