This is an amazing CD reissue, three times over - for psychedelic music buffs, British R&B and soul enthusiasts, and fans of the progressive rock band Gentle Giant (which evolved out of Simon Dupree & the Big Sound). And it's also incredibly long overdue. Best-known for their Oriental ersatz pop-psychedelic classic "Kites," Simon Dupree & the Big Sound actually started out as a blues and R&B-based outfit, not too different from the Spencer Davis Group. This double-CD set covers their complete EMI output, most of which has never been reissued, and almost all of which is very impressive (and even manages to intersect obliquely with Apple Records' orbit)…