khanacademy.org
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Khan Academy is a free, nonprofit learning platform offering courses across many subjects, including Music History. It provides video lessons, articles, and practice exercises on composers, musical eras, genres, and listening examples to explore music history and theory.
More resources on Music History
AllMusic
Artist and genre histories
IMSLP
Public domain scores for historical study
Grove Music Online
Comprehensive music encyclopedia, free trial
Issues of Representation: Women, Representation, and Music in Selected Folk Traditions of the British Isles and North America
Explore women's roles & representation in British and North American folk music. Course by Profs. Tick & Perry examines music history.
Introduction to Western Music
Explore Western music history! This course, taught by Neff & Goetjen, covers key periods and composers.
Heavy Metal 101
Explore the origins and evolution of heavy metal with Joe Diaz's Heavy Metal 101 course! Uncover the genre's history and cultural impact.