Generally speaking, social mass competitions only need 1 to 2 tracks. We can choose an etude that expresses technology in all directions, or we can choose a music with drama and singing. The difficulty and length of the track are usually related to the age of the children. After all, the ability to control the work is the teacher's primary consideration. For amateurs, it is suggested that children in grade one to grade two of primary school choose 1 to 1.5 minutes of works, which should not exceed level four; Children in grades three to four choose the works of grade six, which lasts about 2 to 3 minutes; Children in grades five to six don't play works above grade eight. If junior high school students still have the energy to learn piano, they can choose the difficulty level of 9 to 10, but they should be careful and meaningful. Instead of playing a work beyond one's ability, it is better to follow the rules and let the children play a song with relatively moderate difficulty, but it can express the music incisively and vividly, and the older players are no exception.
If the competition says "both Chinese and foreign music are acceptable", then if you want to attract the judges' ears, you might as well choose a piece by China that the public doesn't often hear. Readers can choose Tong and Pu Fang's "Hundred Flowers Blossom-China Piano 100" published by Shanghai Conservatory of Music Press, or "Centennial Classics of China Piano Solos" edited by Li and Yang Yunlin published by Shanghai Conservatory of Music Press. The former is classified according to the genre and theme of the works, while the latter is classified according to the years, with audio recordings.
In terms of foreign works, the author will talk about which books these tracks can be obtained from. I have published music scores for 6 years, and I have some preliminary understanding of music scores in the domestic market. As a commodity, a publishing house must sell music scores to make a profit. Therefore, driven by economic interests, many music works are socialized, that is, popularized, which the author calls "classic must play". However, this kind of poorly played works (such as graded tracks) may not be suitable for all children to participate in the competition. As far as learning is concerned, those out-of-print albums that don't sell well are actually very good choices. You can look for books on Confucius' old book network or borrow them from some city libraries.
First of all, I recommend Bao Huiqiao's out-of-print series of "A Piano Course with New Ideas", from easy to difficult, which was published by Shanghai Music Publishing House in 2004-2007. The repertoire of this book is all-encompassing, including etudes, polyphonic works, large-scale works (sonatas, variations), and other medium-sized Chinese and foreign essays. Most importantly, most of the music in it is published for the first time in China, and the length of the music varies, which is very suitable for teachers to choose. From easy to difficult, there is a set of books in the form of music selections, and there is an 8-volume Complete Works of World Famous Piano Songs selected by Gail Smith, which was introduced and published by Shanxi Education Publishing House and is out of print.
At the end of last century, People's Music Publishing House introduced and published Hungary.