This superb five-disc box set gives a sweeping overview of the hugely influential music of blues legend Ma Rainey. Rainey was already a seasoned performer by the time she made her first recordings in 1923, and though she only recorded for six years she cut over 100 songs, many of which went on to become blues classics. Those tunes, including "C.C. Rider," "Bo Weavil Blues," and "Ma Rainey's Black Bottom," are here, alongside dozens of other gems. Rainey ranged across styles and settings, from acoustic blues to jazz to jug bands, but her saucy, gritty vocal delivery remained a lynchpin. Given the historical impact of Rainey's output, the set's title--MOTHER OF THE BLUES--is no understatement.