LL Cool JPop singer Janet Jackson's United States tour has been dealt another setback. Rap icon LL Cool J has quit as the opening act for the Rock Witchu roadshow. Jackson was forced to cancel a string of shows due to a bout of vertigo earlier this month, but returned to the stage on October 15th. However, the remaining gigs on the tour will no longer feature an opening set by LL Cool J, after he pulled out of the concerts on Monday. The rapper cited unspecified scheduling conflicts.The "Nasty" singer is due to continue with her first tour in seven years and will play in Auburn Hills, Mich., tonight. She then performs in New York on Saturday.
