1. The tonic triad. This is the triad built on the first degree of the scale. It is the most stable and consonant triad, and it is often used to end phrases or sections of music.
2. The dominant triad. This is the triad built on the fifth degree of the scale. It is the most dissonant triad, and it is often used to create tension or movement in music.
3. The subdominant triad. This is the triad built on the fourth degree of the scale. It is a relatively consonant triad, and it is often used to provide a sense of rest or relaxation in music.
These three triads are the foundation of Western music harmony. They are used in a wide variety of genres, from classical to pop to jazz. By understanding the function and sound of these triads, you can create more interesting and expressive music.