What are the most classic vocals of Cantonese Opera?

There have been three operas in Guangdong, namely, Gusu Opera, Huizhou Opera and Jiangxi Opera, Hunan Opera, Han Opera, Shaanxi Opera and Henan Opera. Yiyang Opera, Kunqu Opera, Shaanxi Opera, Huizhou Opera, Han Opera and Qiyang Opera have been spread and popularized. At present, Cantonese opera vocal music has retained the banqiang, Erhuang, Luantan, Xipi, Furong and other high-pitched tunes, Kunqu opera brands and a large number of ditties imported from other provinces, such as Jade Beauty, Meng Jiangnv, flower cutting, dressing table, selling groceries, Ba Bantou, and Wang Girl's fortune telling. In the banqiang opera, it has successively created specialized operas such as Mugua Opera, Sacrifice Pagoda Opera, Huilong Opera, Jiaozi Opera, Wuer Guijia Opera, Hole-making Opera, and Maizi Opera, and absorbed the temple music (Sanskrit), thus enriching the accents of Yi Fan and ice cloud. Among them, Erhuang board cavity is the most abundant, including cross, figure-eight, long sentence, half, dripping beads, flowing water (that is, second-rate), reverse line and so on.