Seldom if ever was there a more felicitous collaboration between a couple of tunesmiths like the Gershwins, a female warbler like Miss Fitzgerald and a rapier waver like Nelson Riddle than on this set. While there may be more jazz on the Mercer Songbook, more incisive lyrics on the Arlen Songbook, more variety in the accompaniment on the Rodgers & Hart Songbook etc., none of the other albums have the same unique sense of 'rightness', when everything falls into place, where all details fit together like pieces of a big jigsaw puzzle to make one satisfying whole.
This set has a slight edge over the earlier three disc album (which is still available) in that there are some alternative versions added on disc four and some extra music (two orchestral pieces, which are not all that interesting, and one tune which in the narrow sense doesn't belong here, but which is one of the most famous Gershwin tunes: "Somebody Loves Me"), but most of all because of the digital restoration, the extensive liner notes and the complete discographical data (including orchestral personel).
Very warmly recommended!