The electronic keyboard teaching materials include etudes with five or three beats

Meter is a unit for measuring rhythm. In music, there is a series of beats with certain strengths and weaknesses in each beat. Reoccurs at certain intervals. Such as 2/4, 4/4, 3/4 beats, etc. Beat is an organizational form in a piece of music that expresses fixed unit duration and intensity patterns.

The electronic keyboard is an electronic musical instrument, and the sound volume can be adjusted freely. It has a wide range and rich harmonies, and can even produce the effect of an orchestra, with extremely rich expressive power. It can also imitate a variety of timbres, and can even produce sounds that cannot be produced by conventional instruments (such as chorus, wind and rain, cosmic sounds, etc.).