Let's not dwell on the word 'jazz' too much. From what we've heard (BBC-2) the songs are mostly ballads with a very light jazzy, smoky, nightclub flavor. Jazz purists can be pretty tough and I tend to agree with them. The quartet-only version will be the purer versions to have and form an opinion about when reviewing the entire album. We fans know Barbra is quite capable of singing in the jazz style but just have an open mind when categorizing (if you must) this new project.