Canon in D is a musical composition by Johann Pachelbel, a German Baroque composer. Written in the late 17th century, it features a repeating bass line and a series of variations above it, creating a harmonious and flowing sound. The piece is often performed at weddings and other celebrations due to its uplifting melody. The structure of Canon in D consists of three violins and a basso continuo, which provides the harmonic foundation. Its popularity has led to numerous arrangements and adaptations across various genres, making it one of the most recognizable pieces in classical music.