The shortcut is to listen more and practice more
1. Practice scales loudly (1234567). You must sing along with a fixed-pitch instrument (such as piano, organ, harmonica, etc.) in order to develop intonation (this must be practiced every day until you can sing accurately without the piano).
2. Sing along with the music, and be sure to sing loudly. First, find some songs that you are familiar with and sing the lyrics along with the music, and try to sing them accurately (in pitch). After you have become familiar with it, you can then sing the score along with the music until you can sing the score when you hear the sound of the music. This is a process that accumulates slowly. Don't be anxious. As long as you practice seriously and persistently, you will see results in a month or two. .
3. Pick up a new music score and listen to the music first, then leave the music and sing the score yourself, then listen to the music again, and compare where your singing is not good enough (mainly comparing pitch), and then correct.
4. It is very important to pay attention to developing your own sense of rhythm when practicing (even if you sing the notes accurately, you will not be able to sing a piece of music well if the rhythm is wrong). After laying this foundation, you can try to listen to music notation. First, find some familiar and short music and try to write down the score silently, and then check and correct the mistakes against the music. Once you become more proficient, you can try recording some unfamiliar songs.
As long as you keep practicing, it won’t take long and you will find that you can suddenly memorize musical notation (of course, you also need to learn some simple music theory knowledge at the same time, such as "How to Read Simplified Musical Notation", etc.).