Note intervals, pitch intensity, expectations, etc.

1. Note intervals: Changes in note intervals can make the music more layered and varied, thereby increasing the tension of the music.

2. Sound intensity: Changes in sound intensity in music can allow the listener to feel the ups and downs and emotional changes of the music, thus increasing the tension of the music.

3. Expectation: The sense of expectation in music can make the audience look forward to the next development and increase the tension of the music. For example, by setting an unresolved melody or rhythm in the music, you can make the audience feel expectant and excited, and increase the tension of the music.