YMCA
Worldwide organization founded in 1844 on principles of muscular Christianity
Is it normal for people to sing when the YMCA is mentioned?
The YMCA was written about in a widely popular song by "The Village People" The Village People's song "YMCA" had an easy to do and very popular dance routine that went with it.  The song "YMCA" is extremely well known.
In what song was the YMCA written about? Is #1 a very popular song?