Par COUNT GUIDO DEIRO. Count Guido Deiro (1886-1950), Italian-born composer and accordion virtuoso. Deiro was a major force in the popularization of the accordion in the early 20th century. Concert accordionist and scholar Henry Doktorski has transcribed and edited all of Deiro's original music for accordion--45 pieces including waltzes, rags, marches, polkas, fox trots, tangos, and popular Deiro …