The "Trepak" often also goes under the name "Russian Dance" (the other ethnic dances of the ballet have dual names as well, e.g. "Tea" is also "Chinese Dance"). The "Trepak" is arguably the most popular dance of the ballet (although a case could be made for both the "Dance of the Sugar Plum Fairy" and the "Waltz of the Flowers", which are actually heard more often than the "Trepak"). The dance makes common use of ethnic Ukrainian folk melodies.
Tchaikovsky's "Trepak" is written in AABA form. It is played in a prestotempo. It has a time signature of 2/4 and is in the key of G major.