For over nearly two hours , they maintained a relentless pace . The deft production included several built-in musical and video interludes -- including a staggering number of guitar solos -- to keep from going dark during the changes . One of the most impressive spectacles was a very erotic S & M - themed DJ mix session . Rihanna dressed in a tuxedo to cover Prince 's ` ` Darling . ''
For over nearly two hours , they maintained a relentless pace . One of the most impressive spectacles was a very erotic S & M - themed DJ mix session . Rihanna dressed in a tuxedo to cover Prince 's ` ` Darling . ''