What are the songs that "God of Songs" Jacky Cheung finds difficult to sing?

"Three Days and Two Nights", "Li Xianglan", "Exile", "Old Love", "Woman's Heart", "Messy Hair", twelve sounds, basically all the people who imitated him Don’t sing these songs. These are rarely sung. This song is almost a classic from Jacky's peak period. It is extremely difficult to sing. Almost no one in KTV dares to sing this song because the combination of long notes and vibrato and the way of breathing are difficult to control the heat. Many people can't sing it, so they don't dare to click it, even though everyone knows it sounds good. And "Li Xianglan", the conversion between real and false sounds in this song is really difficult.