Over the last few years, just as jazz fans had thought that CD collections of their favorite iconic jazz musicians were “complete” (since the legendary artists had been deceased for decades), we have been treated to welcome releases from European sources of previously unreleased material. The latest bonanza comes from CAP (Consolidated Artists Productions), of never before heard recordings of Dizzy Gillespie’s Quintet from a two week engagement in August, 1973, at Ronnie Scott’s club in London. (CAP is owned by the quintet’s pianist, Mike Longo.)