New York University
Music Literature: The Classical Period
Resource provides information on the Classical Period in music by discussing the three main composers most notably associated with that period: Haydn, Beethoven, and Mozart.
Classical Net
Classical Net: Renaissance Repertoire: Renaissance Composers
Those well-versed in music will find this site helpful, as it offers biographical information on a number of Renaissance composers, along with pictures and information on compositions.
Other
Guild Music: Edvard Grieg
This resource provides a brief biography of Edvard Grieg, an international Scandanavian composer of the 19th century. Information is also given on his most famous work, "the Cello Sonata in A minor opus 36."
Northern Arizona University
Northern Arizona Univ.: Symmetrical Binary Principle
This site from the Northern Arizona University contains the meanings of the symmetrical binary principle in Bach's music and several other composers of this period.