‘Someone left the cake out in the rain” …

The long, varied history of Jimmy Webb’s tune “MacArthur Park” will take yet another turn on this Monday’s “Late Show with David Letterman.”

The song, famously recorded in 1968 by actor Richard Harris, has been covered by everyone from Carrie Underwood to Weird Al Yankovic to Donna Summer, who did a chart-topping disco version in 1978.

On Monday’s “Late Show” (11:35 p.m./Ch. 2), “MacArthur Park” will be performed — in its six-minute entirety — by the CBS Orchestra, led by “Late Show” band leader Paul Schaffer, with Webb playing the harpsichord. Shaffer, Will Lee (on vocals), Webb et al. will be assisted by an additional 23 musicians, including a bevy of string players. Webb is also known for penning “Worst That Could Happen” as well as “Wichita Lineman” and “By the Time I Get to Phoenix” — both recorded by Glen Campbell.

Trivia fact: Harris talked about his recording of “MacArthur Park” as one of the last guests on Johnny Carson’s “Tonight Show” in 1992.

– Michael Starr, The New York Post