Less than two years after the first volume was issued, Real Gone Music is returning to the classic Stax singles of Booker T. and the MG’s for The Complete Stax Singles Vol. 2 (1968-1974).  The 20-song collection is due on September 3 in 1CD and 2LP formats, completing the anthology of all 49 sides released by the band at Stax. The Complete Stax Singles Vol. 2 (1968-1974) picks up the story of Booker T. Jones (organ), Steve Cropper (guitar), Donald “Duck” Dunn (bass), and Al Jackson, Jr. (drums) as they ushered in…