Beatles covers No. 1s

I thought that Slate was becoming unreadable, and they publish this gem of an article:

Lennon’s and Elton’s sessions in the summer and early fall of ’74 changed all that. Elton did Lennon a major solid, singing backup on “Whatever Gets You Thru the Night” and betting Lennon that the song would be his first solo-career chart-topper; if proved right, Elton said Lennon had to join him in concert. In November, “Whatever” indeed became Lennon’s first solo No. 1 single, and the Beatle made good on the bet by appearing at an Elton John show at Madison Square Garden at Thanksgiving 1974. (It turned out to be Lennon’s last live appearance.)

via Slate.