Medieval music refers to the music created during the Middle Ages, roughly from the 5th to the late 15th century. This period saw the development of various musical forms, including sacred music for the church and secular music for entertainment. Notable styles include Gregorian chant, characterized by its monophonic and unaccompanied melodies, and troubadour songs, which were performed by traveling musicians. Instruments used during this time included the lute, harp, and organ, which accompanied vocal performances. The notation system evolved, allowing composers to write down their music, leading to the emergence of early polyphony. This laid the groundwork for future musical developments in the Renaissance period.