Here are several versions of what might be one of the best songs ever written, Cole Porter's haunting (and slightly unsettling) 'Night and Day', ranging from the inspired to the downright odd. I had no idea Ringo Starr recorded it, nor do I know anything about the Japanese girl-group version except that it has a very weird video. If it weren't for a slightly messy ending, the version by Everything But The Girl would definitely get my vote, as its pared-down approach and Tracey Thorn's wonderful voice really allows the song's melody to shine. And I love the ukelele version!
Sister Q - Night and Day by ChibiLune