Pink crossed with purple at the Royal Albert Hall, as a purple orb shone over the stage like a purple sun, spotlights bathed the imperious Victorian interior in luminous hues of violet, and David Gilmour segued Pink Floyd’s Comfortably Numb into Prince’s Purple Rain. In the midst of the longest, brightest burning coda to the Floyd rock classic you could ever wish to hear, the band shifted seamlessly into the Prince chord sequence, Gilmour showering his rapt audience at this Teenage Cancer Trust benefit gig with a cascade of glittering guitar notes while a trio of backing singers delivered descending, “Oooh, oooh, oooh, oooh’s”. No words were said or needed to be, as one incredible guitarist paid tribute to another....

http://www.telegraph.co.u...view-gilm/

To slip a tribute into your signature song is the ultimate show of respect to a fellow musician. A classy nod from one guitar god to another.