Count Guido Pietro Deiro (September 1, 1886 - July 26, 1950) was a famous vaudeville star, international recording artist, composer and teacher. He was the first piano-accordionist to appear on big-time vaudeville, records, radio and the screen. he usually performed under the stage-name "Deiro". Guido and his younger brother Pietro Deiro (known as "Pietro") were among the highest-paid musicians on the vaudeville circuit, and they both did much to introduce and popularize the piano accordion in the early 20th century.
Born Guido Pietro Deiro in the village of Salto Canavese, in the fraction of Deiro, near Turin, Italy. He was born into a family of rural Italian nobility that were involved in raising dairy cattle, growing wine grapes, tending fruit orchards, and operating general stores to sell their produce. While a young boy, Guido entertained himself by playing the ocarina, an ancient flute-like wind instrument usually made from ceramic or wood. His uncle Fred noticed Guido’s unusual musical ability on the ocarina, and decided to get him a more sophisticated instrument, a diatonic button accordion. Guido started to play the accordion when nine years old. His father allowed Guido to play this two-row accordion in the street outside his stores because Guido’s playing would draw a crowd and attract potential customers. Deiro became a student of the famous Italian accordionist-composer Giovanni Gagliardi.
Deiro left his home to avoid an arranged marriage, and defying his father's wishes that he manage the family businesses, he became a professional entertainer and took engagements in France and Germany playing the chromatic accordion. His success as a performer led the Ronco-Vercelli accordion company in Italy to ask him to demonstrate their new piano-accordions at the Alaska-Yukon-Pacific Exposition in 1908. This world's fair was held in Seattle from June to October 1909. After the fair, he stayed on in Seattle working as a musician in saloons. By this time, he had become a virtuoso at playing a piano accordion. In 1910 he was discovered by an agent for the Orpheum Vaudeville Circuit. His opening debut was at the American Theatre in San Francisco (managed by Sid Grauman) on June 15, 1910. He became an immediate sensation, and began traveling the vaudeville circuit routinely back and forth across the United States and Canada (and other countries as well) as a headliner. During his travels, he met and became friends with another famous Italian accordionist: Pietro Frosini.