First of all, singers will go through a lot of practice, and after a lot of practice and repetition, they are naturally inferior to ordinary people. Singers are usually professional singers. Their job is to sing. A lot of intensive exercises will be carried out every day, and behind the glamorous is sweat and hard work! You can't just go to the concert.
Secondly, singers will not only have a lot of practice, but also have their own tips. Every time they hold a concert, many staff members worry about them. They all have headphones, so even if they forget, there will be hints! So basically the lyrics can't be wrong.
Finally, singers can't rely entirely on memory. Concert is not only a performance by one person, but also an interaction with one's fans. Wouldn't it be awkward to break the film after the interaction? Therefore, no matter how perfect they practice, they are fully prepared to go on stage.
Knowing what I said above, do you think stars are ordinary people? Their abilities are also acquired through continuous intensive exercise? So as long as you practice hard, you will become as good as a star. Many stars are also born at the grassroots level. Therefore, everyone has no superhuman powers, they are all ordinary people! In addition to our own efforts, the help of modern high technology has also played a great role!