That is a Grand Prix (the highest) level horse doing Musical Freestyle, which is fun type of competition to watch. In normal dressage competition, there is a pattern set and everyone rides the same pattern. In Musical Freestyle, the horse and rider get to choreograph their own... and this guy chose the movements and music that would show his horse off perfectly.
Well, I’ve never really seen high level dressage period...but that was great..
Becky