http://www.slate.com/articles/arts/culturebox/2015/07/beatles_covers_no_1s_the_three_strange_lennon_mccartney_hits_that_weren.html

Fifty-one years ago this summer—in late June 1964—the No. 1 song on Billboard’s Hot 100 pop chart was a Lennon-McCartney composition. Only it wasn’t by the Beatles, and John Lennon had nothing to do with it. It was a Paul McCartney–penned song recorded, and taken to the chart summit, by a British duo named Peter and Gordon, one of whom was McCartney’s would-be brother-in-law.