In 2006, Ghostface teamed up with underground artist MF DOOM for a still-unreleased album entitled "Swift & Changeable". MF DOOM also produced several songs for Ghostface's 2006 album "Fishscale", on which he chose to revert to the stage name “Ghostface Killah", rather than just “Ghostface”. The album debuted strongly, appearing at the #4 position on the U.S. "Billboard" 200 and at #2 on the R&B charts, the rapper's most auspicious chart showing since the heyday of the Wu-Tang Clan and the release of his solo debut. The album also received near-unanimous positive reviews. Ghostface embarked on a limited-date tour of U.S. venues in support of the album, performing several of his concerts together with most of the other members of the Wu-Tang Clan. On December 4, 2007, Ghostface released his seventh solo studio album, "The Big Doe Rehab".