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.

Live is celebrating 50 years of late night comedy this year and one of the prime time specials that aired recently was 50 Years of SNL Music which featured past music performers since the show's debut in 1975.

NBC’s celebration of “Saturday Night Live’s” 50-year history will continues this week with a new 3-hour documentary titled “Ladies & Gentlemen… 50 Years of SNL Music.”