Riverdance from the packed theatre of 4,000 people. The performance is often considered the most well known interval act in Eurovision Song Contest history. Riverdance was later performed as an interval act at both the "" (2005) and "Eurovision Song Contest's Greatest Hits" (2015) events. Lead dancers Michael Flatley and Jean Butler transformed the previously chaste and reserved traditional dance form into something else entirely. The song "Riverdance" was released as a single and entered the Irish Singles Chart at No. 1 right after the Eurovision debut, staying there for 18 weeks—the longest amount of time a song has ever topped
Step dance the Riverdance troupe significantly altered its competitive form from traditional Irish standards. Both traditional and more modern competitive styles are characterized by the use of specific shoes and by costumes that can be remarkably elaborate. Irish stepdance is, as of 2017, the only form of step dance to which a Broadway production, "Lord of the Dance", has been devoted. Tap dancing is a modern form of step dancing taking its influence from a variety of older step-forms. A traditional form of individual step dancing is still found in certain areas of England such as East Anglia and Dartmoor. This style