An "Ostinato" is a musical phrase or rhythm that is persistently repeated throughout a piece of music. This technique can be found in various genres, including classical, jazz, and popular music. The repeated section serves as a foundation, allowing other musical elements to develop and change around it. Ostinatos can be melodic, harmonic, or rhythmic. A well-known example is the Pachelbel's Canon, which features a repeating bass line. This repetition creates a sense of stability and familiarity, making it a powerful tool for composers and musicians to build upon and explore different musical ideas.