August Wilson's play "Ma Rainey's Black Bottom," about the black woman known as the mother of the blues, now streams on Netflix. It stars Viola Davis as Ma Rainey and is the last film with Chadwick Boseman before his death from cancer in August. Hear theater critic Howard Shapiro's review this week on In a Broadway Minute, Friday (1/1) at 8 am and Saturday (1/2) at 10 am.