Oh, absolutely. Earliest one I'm aware of is Bach's "Art of the fugue", where he embedded his name as a third voice. See http://en.wikipedia.org/wiki/BACH_moti

Oh, absolutely. Earliest one I'm aware of is Bach's "Art of the fugue", where he embedded his name as a third voice. See http://en.wikipedia.org/wiki/BACH_motif http://en.wikipedia.org/wiki/BACH_motif