It's generally acknowledged that many classical composers have written some of their best music for ballet. It could also be argued that some of the greatest jazz is played when the musicians are aware that, in its essence, jazz is dance music (as Dizzy Gillespie put it, you don't have to be able to dance to play jazz, but it helps). Rhythm and blues, has always been associated with dance, and it's fitting that the great record producer who first coined the term, Jerry Wexler, was a key component of one of the greatest r&b recordings. According to the guitarist on the session, Steve Cropper, Wilson Pickett's "In the Midnight Hour" was altered (and improved) in the hopes of capturing the feel implied in a new dance that Wexler demonstrated for them - apparently he had seen it done in clubs in New York. Cropper used the term "delayed backbeat" to describe the wicked groove that resulted: http://www.youtube.com/watch?v=FGVGFfj7POA&feature=related. Happy New Year!