Polyphonic sound refers to music that features multiple independent melodies played simultaneously. This technique allows for a rich and complex auditory experience, as different musical lines interact with one another. It is commonly found in various genres, including classical music, where composers like Johann Sebastian Bach utilized polyphony to create intricate compositions. In contrast to monophonic sound, which consists of a single melody, polyphonic sound can create harmony and depth. Instruments such as pianos and string quartets often employ polyphonic techniques, allowing musicians to explore various textures and layers within their performances.