Evenin' all,
This site has been out for several years, and I'm sure a lot of you have seen it before. But I recently re-discovered this site after a year of two of forgetfulness.
http://www.sr.se/p1/Src/sing/
Give it a go, it's really good fun if you get the words right.
Just type in a few lines, and it will grab words from songs and play them all back in one go.
http://www.sr.se/P1/src/sing/index.htm?key=P7HS4AHD
Dan