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Musical cryptogram
A musical cryptogram is a cryptogrammatic sequence of musical notes, a sequence which can be taken to refer to an extra-musical text by some 'logical' relationship, usually between note names and letters. The most common and best known examples result from composers using ciphered versions of their own or their friends' names as themes or motifs in their compositions. Much rarer is the use of music notation to encode messages for reasons of espionage or personal security called steganography.
Because of the multitudinous ways in which notes and letters can be related, detecting hidden ciphers and proving accurate decipherment is difficult.
==History==
From the initial assignment by Western music theorists of letter names to notes in the 9th century〔Hiley, David 'Notation III, 1 (vi)' in Sadie, Stanley (ed.), ''The New Grove dictionary of music and musicians'', Macmillan, 1980, (6th ed. of the Grove dictionary), vol.13, p. 348–349〕 it became possible to reverse the procedure and assign notes to the letters of names. However, this does not seem to have become a recognized technique until the Baroque period. From the mid-19th century it has become quite common. Sporadic earlier encipherments used solmization syllables.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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