who wrote the brodwat musical Fosse?

Answer 1

"Creative credit for all this--apart from the all-important spirit and imagination of Fosse himself--belongs to four people: Chet Walker, Richard Maltby, Ann Reinking, and the shoe's artistic adviser, Gwen Verdon.

It was Walker, a longtime Fosse associate dance captain, who first had the idea of the revue and discussed it with Fosse as early as 1986, and he is responsible for the re-creation of Fosse's original choreography. Reinking is both codirector and cochoreagrapher, while Maltby is named as the director, as well as coconceiver, alongside Reinking and Walker."

Answer 2

Well, Fosse the Musical was just kind of a retrospective tribute to Fosse, and doesn't have a storyline. It is just a collection of some of his most famous works. So as far as music:

COMPOSERS & LYRICISTS
Various Artists (from different musicals)

As far as the idea for the show:

CONCEIVED BY
Richard Maltby, Jr., Chet Walker, and Ann Reinking

Hope that helps.