What is the most commonly used ringtone in school and class?

Piano music that is often used as a class bell is as follows:

Starry Richard clayderman

Love commemorates Richard Clayderman.

Joe Hisaishi, the city of the sky.

Croatian Rhapsody "Motto"

Memory Richard Clayderman

Whispers of Autumn Richard Clayderman

Most schools choose these piano music.

Generally speaking, most school clocks are the climax of choosing each piece of music.