Cyber Hymnal
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Words, music MIDI files, background on composers for a wealth of music in public domain. (Also sheet music if you have NoteWorthy.)--tambien en espaņol-- [broken link]
Song Query
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What CD has the song you want? Find sheet music, accompaniment tracks and more. [broken link]
VisuWords
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A dictionary that shows you how words and ideas are related to each other -- great for narrowing down a research topic! [broken link]