What role does the keyword "pitch" play in music theory and how does it affect the overall composition of a musical piece?

In Music Theory, the keyWord "pitch" refers to the highness or lowness of a sound. It is a fundamental element that determines the melody and harmony of a musical piece. The pitch of notes creates the melody, harmony, and overall mood of a composition. Different pitches can evoke different emotions and create tension or resolution in a piece of music.