Members of the Wu-Tang Clan are recording a tribute to colleague Ghostface Killah, who's facing a three-month stretch behind bars. The song, "Iron Vacation," will be featured on his upcoming solo album, Supreme Clientele, according to Epic Records publicist Jon Oliver. Oliver said Wu-Tang producer RZA, fellow member Raekwon the Chef and associate Cappadonna have recorded vocals so far, and others, including Method Man, may contribute. Scheduling conflicts caused by Ghostface Killah's six-month sentence for attempted robbery -- he's expected to serve three months -- have delayed the release of Supreme Clientele until late summer.