At its best, the final date of the Legends of Hip-Hop tour last Saturday at the Milwaukee Theatre made the music presented there almost feel as if it weren't an exercise in nostalgia. At its worst? Well, as The Notorious B.I.G., and The Last Poets...

It had to happen eventually. Rap music gets the oldies revue treatment on Salt-n-Pepa's Legends of Hip-Hop Tour, which pairs the groundbreaking '80s and '90 female hip-hop duo (and their longtime DJ Spinderella) with genre pioneers Kool...