Below is a link to one of the best pieces of sound engineering work I think I have ever seen.
It is a composite audio/video of song whereby additional tracks were laid in by different singers and musicians from different places around the world. The finished product is tremendous!
"Stand by Me" is the title of a song performed by Ben E. King and written by Ben E. King, Jerry Leiber and Mike Stoller. The song is inspired by a traditional Gospel song of the same name, originally composed by Charles A. Tindley in 1905, and recorded by numerous artists, including a 1955 version by The Staple Singers. Leiber and Stoller gave it a more contemporary sound. Since its release, there have been many cover versions of the song, though none have achieved the fame of the original. This composite version is a real toe tapper.
http://vimeo.com/moogaloop.swf?clip_id=2539741