Beijing Opera has four main roles - Sheng, Dan, Jing, and Chou. Sheng are male roles like warriors or gentlemen, while Dan are female like noblewomen or charming girls. Jing roles have painted facial makeup indicating complex personalities, and Chou are clowns. Key techniques include singing, speaking, acting, and fighting. The orchestra accompanies with percussion for action and strings/winds for emotion. Famous performer Mei Lanfang mastered vocal and physical skills across different roles.