POP/ROCK. Madonna - Bedtime Stories (Warner Bros.): After recent. forays into movies and books, and an exhaustive tour, Madonna is taking a break from all the gimmicks and controversy to get back to basics with her latest album, ``Bedtime Stories.'' Collaborating with singer/bassist Me'Shell Ndege Ocello and producer Babyface, among others, Madonna has blended her voice with the talents of some of R&B's brightest musicmakers. What she lacks in lyrical complexity she makes up for in a groove that flows from track to track - creating a cohesive sound, with its roots seeming to come more from 1970s disco than today's hip-hop.