This volume is the first book-length study of hooks in popular music. Hooks - those memorable musical moments for listeners such as a riff or catchy melodic phrase - are arguably the guiding principle of much modern popular music. The concept of the hook involves aspects of melody, rhythm, harmony, production, lyrical and cultural meaning - and how these interact within a song's topline and backing track. Hooks are also inherently related to the human capacities for memory and attention, and interact with our previous experiences with music. Understanding hooks in popular music requires a new interdisciplinary approach drawing from popular music studies, pop musicology, and music psychology, and this book draws from each of these disciplines to understand the hooks present in a broad range of popular music styles from the last thirty years.