Happy: how it works
Pharrell: “Because I’m happy. Clap along if you feel like that’s what you wanna do.” Stewart: There is the importance of movement (in the song’s video) in reinforcing the song — socalled embodied listening — while the call to “clap along” is highly engaging and social. Pharrell: “Because I’m happy. Clap along if you feel like a room without a roof.” Stewart: It’s replete with repetition, so we can grasp the tune with the minimum listening effort. Pharrell: “Because I’m happy. Clap along if you feel like happiness is the truth.” Stewart: It’s an earworm. It gets stuck in our head because of its long-duration notes and relatively small changes in the melody — like a jingle — which make it easy to sing along to.