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 early polyphony, where multiple independent melodies were sung together. Instruments used during this time included the lute, harp, and organ, which accompanied both vocal and instrumental performances. Composers like Hildegard von Bingen and Guillaume de Machaut contributed significantly to the evolution of music, laying the groundwork for future musical traditions.