2, of course, the first thing to understand the meaning of the beat or beat number. Beats, that is, a song of how the notes are arranged in each bar a principle - length (each bar has a few beats), how the law of strength and weakness are determined by it. First of all, 4/4, 2/4, 6/8, their beat accent does not appear in every four beats of the first beat; every two beats of the first beat; every six beats of the first beat. Also note the number of beats in the first and last bars of the piece. Usually, if the bar is not weak, you can judge it according to the strength pattern and the number of beats in the last bar. There is also according to the mood of the piece, 4/4 beat gives a soothing, steady feeling; 2/4 beat is lively, enthusiastic or march; 3/4 beat is the feeling of the round dance; 6/8 beat is similar to the 3/4 beat, but stronger than the 3/4 beat flow sense.