When I say strong, I mean singing louder; Weak means singing softly.

In a song, the strength of a beat is regular. One beat is strong, one beat is weak; A song that is forced to beat but weak is called a double beat song. Use "strong, weak, weak; Strong, weak, weak ... "A song with repeated beats is called a three-beat song. With "strong, weak, second strong, weak; Strong, weak, sub-strong, weak ... songs with repeated beats are called four beats.

The law of the strength of songs is expressed by time symbols. The time signature is marked on the upper left of the score.

The signature of double beat is 2/4;

The time symbol of triple time is 3/4.

The four-beat time is 4/4.

The time signature looks like a score, but the pronunciation is different from the score. Two beats should be: "24 beats" or "42 beats"; Triple time is pronounced as "any four beats" or "four beats or three beats". Four beats is pronounced as' four or four beats'.

2, 3 and 4 marked in front indicate 2, 3 and 4 beats respectively. The 4 marked at the back indicates that the quarter note is a beat.