A good anecdote is told of Josquin [des Prez] and his royal patron, Louis XII. The king was particularly fond of a certain popular song, and desired Josquin to arrange it for several voices, and to include a part for himself (Louis). The last condition was rather a puzzle for the composer, as the king knew nothing of music, and had a very bad and unpliant voice; however, he set to work, wrote a canon on the melody for two boys’ voices, added a part for the king which he marked ‘Vox Regis,’ consisting of only one constantly repeated note, and placed below a bass part which he took himself.

— Musical Times, June 1, 1884