A Dictionary of Musical Themes
A Dictionary of Musical Themes (New York: Crown, 1949) is a music reference book by Sam Morgenstern and Harold Barlow. == Contents == The book collects 10,000 musical themes (mostly classical works) and indexes them using a notation index based on transposing the pitches to C major or C minor (so that God Save the Queen/America, for instance, would come out as CCDBCDEEFE).
Source: Wikipedia — A Dictionary of Musical Themes (CC BY-SA 4.0)