Live” is having a 50th anniversary, and things are happening. Jason Reitman’s backstage dramedy “Saturday Night,” released last year, is

It's a mashup of performances from artists that few people would think of putting together, like R.E.M. and Morris Day, Rick James and Duran Duran, Hanson and Cher. Filmmaker Ahmir “Questlove” Thompson's experience as a DJ taught him enough about beats per minute and musical keys to meld things seamlessly.

(Photo by Evan Agostini/Invision/AP, File) The startling “cold open” for a documentary about 50 years of “Saturday Night Live” music is proof ... like R.E.M. and Morris Day, Rick James and Duran Duran, Hanson and Cher. Filmmaker Ahmir “Questlove ...

Also back at Studio 8H for their eighth appearance was musical guest Coldplay, who performed music from their latest album, Moon Music, which was released the day before. Special Guests ...