Toby Keith has added two more rock stars -- Aerosmith's Steven Tyler and Joe Perry -- to perform in a CMT Crossroads episode, which airs live on Saturday (Jan. 31). As previously announced, Keith will also be joined by Willie Nelson, Sammy Hagar, members of Run DMC and Red Hot Chili Peppers, and jazz musician-athlete Wayman Tisdale. The one-hour special will take place in Houston on the night prior to Super Bowl XXXVIII.