The Galop is a style of dance set to lively music in 2/4 time that became fashionable in the mid-19th century.  It was usually the last dance of the evening.  The Can-Can, which was originally a dance for couples, is an extreme version of a Galop.  Below is part of a composition by Franz List.  OF the romance dances of the 19th century, the most popular where: Waltz, Galop, Polka, Schottische and Polka-Mazurka.

Before gaining popularity in America, the Galop was already popular in the ball rooms of Europe.  This style also influenced American music such as Country-Western dance and Rag-Time.