Record Company The New York Recording Laboratories New Release in February, 1928 Dealers' List. First advertised in the Chicago Defender on February 18, 1928 as Ma Rainey's Black Bottom / Last Go Round. Corrected B-side listed on March 3, 1928. Matrix / Runout: 20229-2 (Side A, Runout) Matrix / Runout: 20229 (Side A, Label) Matrix / Runout: 20232-1 (Side B, Runout) Matrix / Runout: 20232 (Side B, Label)