Pitch refers to the highness or lowness of a musical note determined by its rate of vibration. Melody is a sequence of pitches that forms a coherent musical idea. The document discusses the importance of pitch and melody in music and how they relate to the physical science of sound. It then outlines several key concepts the reader will learn, including identifying pitches and melodic contours, the relationships between notes, scales, and dynamics. Examples are provided to illustrate these concepts and the differences between conjunct and disjunct melodies and tuneful versus atonal melodies.