This dissertation explores the influence of melody on harmonic function in pop and rock songs from around 1950 to the present. While authors define the term "function" in several ways, none consider melody in their explanations, and I contend that any discussion of harmonic function in rock must include melody. I offer a novel perspective on function by defining it through what I call tension-as-anticipation, and I define a "melodic function" that accounts for the sense of tension and relaxation a melody creates within a particular moment in a track. My dissertation defines two types of melodic function—dominant and tonic—based on the melody's goal-directed scale-degree content, position within a phrase, and relation with the harmony. Dominant-melodic function results in two musical phenomena that I call the "imposed dominant" and the "dominant remainder." An imposed dominant occurs when a dominant-melodic function is initially dissonant with the harmony and resolves over a tonic. A dominant remainder occurs when a dominant-melodic function occurs over a harmonic resolution to the tonic, creating a slower dissipation of tension. Tonic-melodic function produces a phenomenon I call the "tonic anticipation," where a melody outlines a tonic mode over a pretonic harmony, creating a maximum sense of tension-as-anticipation. By including melody in considering harmonic function, we can more adequately describe the cycles of tension and resolution found in pop styles.