Natalie Cole approached pop from all angles, and she made that fact plain with her cover choices. Her version of the slow-burn classic “Fever,” which paired her with Ray Charles, showcased her sterling vocals; she transformed The Beatles' “Lucy In the Sky With Diamonds” into an exploration of funk; and she turned the standard “L-O-V-E” into a tribute to her father, the bandleader Nat King Cole, that combined classic and modern ideas of jazz.