In the system, the meaning of the singer is not clearly expressed. In the public mind, a singer can only sing and make a sound. In this case, most of them don't understand notes and music theory, but just think they can sing. If the definition of singer is narrowed down to those who have no other skills except singing, then such "singers" will have the basic knowledge of music theory. But I'm not sure if they can't move the instrument.
Let alone creative singers, such as Wang Leehom, Jay Chou and Tao Zhe. They must know musical instruments, because when creating, they must feel the key points of melody by themselves, and they must know which instrument is more important than that. In fact, Eason Chan is also a well-trained person. He also graduated from the Royal College. What do you think of his music theory? He even wrote a song himself.
In fact, singers in the real sense have rich basic knowledge of music. An old artist like Leslie Cheung plays the piano very well and shows a high standard in his own songs. For today's young people, most of them also started with their own creations. No matter whether they are wild or not, they all have two brushes. As for you, to what extent do you want to know? Interval, harmony, rhythm, bars, these foundations, can not be bad.
A singer who doesn't understand music theory but is very popular! Jonathan Lee said he couldn't read the music. Can you believe it? Jonathan Lee himself is a master of open tuning. He can't play the guitar well, and others say he doesn't understand. That's modesty. Nicholas Tse also said that he couldn't play the guitar, but his level in his early concerts was not bad at all. It is said that Andy Lau knows erhu and once performed "Days We Walk Together" in his concert, but this passage was not included in the VCD of the concert, probably because he didn't play very well. But Andy Lau should not be good at other musical instruments, and neither should Hanako, a guitar flute.