What is a pitch in music and how does it contribute to the overall sound and harmony of a musical composition?

A pitch in music refers to the highness or lowness of a sound. It contributes to the overall sound and harmony of a musical composition by creating melodies, harmonies, and chords. Different pitches played together create harmony, while a sequence of pitches forms a melody. The combination and arrangement of pitches in a composition determine its mood, emotion, and structure.