Final answer:
A chord is a combination of three or more pitches sounded simultaneously, used to create harmonious sounds in music.
Step-by-step explanation:
A chord is a combination of musical notes played or sung together to produce a harmonious sound. In Western music theory, the most accurate answer to the question would be a chord is:
Option 2) A combination of three or more pitches sounded simultaneously.
Musical notes, such as A-sharp, C, or E-flat, are particular sounds that have specific names and can be produced by most instruments. Combinations of these musical notes generate tunes and can greatly vary in number and relative intensity of their multiple frequencies. This diversity creates the rich fabric of music we enjoy, from simple triads to complex harmonies.