The arrangements are very nicely done, there are some very good soloists in the band, the latter are quite tight and full, and the program gives a solid mix of classics redone and new material. Nelson's "Stolen Moments" sounds glorious with lyrics, and there are nice approaches to some American songbook standards, a Paul Simon tune, and some worthy new fare.
What impresses throughout is the musicianship of all concerned. The WDR bands, thanks to government support, gig and rehearse extensively as I understand, and you can hear that here.
It's something of a hoot. If you like the idea, you are half the way there. They fulfill their end of the deal with a thoroughly enjoyable set.