ENTERTAINMENT
October 17, 1998 | MARC WEINGARTEN, SPECIAL TO THE TIMES
Chaka Khan, whose fiery singing on such hits as "Tell Me Something Good" and "I Feel for You" have made her one of the legendary voices in R&B, is slouched in a chair backstage at the Great Western Forum, a pack of Merit Lights in her left hand. It's Thursday night, but Khan is hardly in a partying mood. Less than an hour before she's scheduled to appear with co-headliners Larry Graham and Prince (a.k.a.