Michael Flatley ruined dance.

Irish dancing is seen as a beautiful art-form in modern day Ireland and in cities throughout the United States. Ceili's are the traditional form of Irish dance. It is a group of people at a party or gathering who perform traditional dances, reenacting famous historical moments and battles. Today, competitions (more commonly known as a feis) are held in major cities throughout the US for men and women of all ages. Winners can more on to more serious competitions in London, Glasgow and Dublin. The modern form of Irish dancing seen today was brought to light by Michael Flately, the flamboyant creator of Celtic Tiger and Lord of the Dance. He popularized Irish dancing into the phenomena it became in the early nineties. He even opened a major production in Las Vegas. The horrendously tacky outfits and dance pieces have taken away from the original, traditional form of Irish dancing. The websites are of Michael Flatley's Lord of the Dance and his home page. If you watch the intro on his home page, you will get a taste of how he "transformed" Irish dancing.
http://www.michaelflatley.com/home.cfm
http://www.lordofthedance.com/