"time signature" 的定义和意义

What is a "time signature"?

A time signature is a musical notation that specifies how many beats are in each measure and which type of note receives one beat. It is shown as two numbers stacked vertically at the beginning of a piece of music. The top number indicates the total number of beats in each measure, while the bottom number denotes the note value that represents one beat, such as a quarter note or eighth note. Time signatures help structure the rhythm and timing of the music.