Whether you love the songs of the 1910s or more recent fare, this fascinating sheet music collection from the Library of Congress is a real find. The database includes "hits and flops" from famous Tin Pan Alley songwriters like Irving Berlin, along with manuscript materials from amateur composers. All told, this database contains materials from over 18,000 shows and productions from the 1690s to the present. (Not every item includes complete sheet music, as some of the materials are restricted by copyright laws.) Visitors can search the collection by song title, composer, lyricist, or date of issue. It's fun to start the journey by typing in the names of some favorite, celebrated composers, such as Jerome Kern, Oscar Hammerstein, and George Gershwin.