Improvisational theatre and comedy are long-standing New York traditions. I've always held in high esteem artists who create performance sequences, let alone entire shows, with little prepped content. The fiendish difficulty of coming up with material spontaneously is exacerbated by the need for a good show to have some semblance of pace and structure.Now imagine adding not only a musical, but also a hip-hop element to it. That's freestyle love supreme, taking the crown for the most ambitious...