Madonna's 1986 True Blue sold 25M copies, almost 11M more copies WW than Control.
Madonna's 1989 Like a Prayer sold 15M copies, about 1M more copies than Rhythm Nation 1814.
It wasn't until Janet's 1993 janet. that she outdid Madonna when she sold 20M copies WW, 14M more copies than Madonna's 1992 Erotica and 13M more than her 1994 Bedtime Stories.
Madonna's 1998 Ray of Light doubled Janet's 1997 The Velvet Rope.
Music outsold all of Janet's subsequent album releases to date.
According to her die-hard stans she did not sold 20M copies.