In “jazz singer” a group of artists grapple with making a piece of theatre about the film “The Jazz Singer” by examining its roots in Jewish mythology, wrestling with its use of blackface, exploring vital themes of assimilation, appropriation, and atonement, and questioning its legacy.  While the piece substantively evinces the feel of a work still in progress, the production design is impeccable and unimpeachable, and its mission is achieved.