ITEM 7: WAI KRU AND ROUND DEFINITION
7.1. Prior to the start of the first round, both fighters shall perform the Wai Kru (paying respect to the teacher), accompanied by the appropriate Thai traditional music, incorporating the Ching (cymbal), Klong khaek (tom-tom) and Pee Java (Thai reed pipe).
7.2. A Muay Thai match shall consist of five rounds, 3 minutes per round with a 2 minute break between each round. Any stoppage during the match for any reason, will not be counted as part of the 3 minute round time.
Photo credited to miss-informed
Credit to MuayThai.com