Symbols used in music scores are marked in the form of fractions. Every score is preceded by a time symbol. If the middle rhythm changes, the changed time symbol will be marked, just like a score, such as 2/4, 3/4, etc.
Molecules represent how many beats there are in each bar. As mentioned above, 2/4 beat means taking a quarter note as one beat, 2 beats in bars, 3/4 beats in quarter notes, and 3 beats in each bar ... The reading method is to read the denominator first, then the numerator. For example, 2/4 is 42 beats, 3/4 is 43 beats, and 6/8 is 86 beats.
Extended data:
The time signature should be marked at the beginning of the music, behind the score of the first line of the music. (But if there is key signature, you should draw key signature first, and then draw the time signature. ) The sequence is as follows: clef → key signature → time signature.
When the time signature is marked on the score sheet, three lines (the line in the middle of the staff) should be used as the horizontal lines of the score, and there is no need to draw horizontal lines. If you don't change the beat halfway, just write it at the beginning. If you change the beat halfway, you need to mark a new beat number.