Real Dictionary

early music in American English
music of the medieval and Renaissance periods, now sometimes including baroque and early classical music

early music in British English
modifier: of or denoting an approach to musical performance emphasizing the use of period instruments and historically researched scores and playing techniques
noun: music of the Middle Ages and Renaissance, sometimes also including music of the baroque and early classical periods

early-music in American English
designating, of, characteristic of, or participating in a movement promoting the modern reproduction of historical styles of musical performance, often through the use of period instruments

early-music in British English
modifier: of or denoting an approach to musical performance emphasizing the use of period instruments and historically researched scores and playing techniques