Pietro Alessandro Yon (August 8, 1886 November 22, 1943) was an Italian-born organist who made his career in the United States.
Yon was born in Settimo Vittone, Italy, and studied at the conservatories of both Milan and Turin, also attending the Accademia di Santa Cecilia in Rome. He served for a time as an organist at the Vatican and at the Royal Church in Rome before coming to the United States in 1907; he eventually became an American citizen. From 1907 until 1926 he was the organist of St. Francis Xavier Church; in 1926 he became the organist of St. Patrick's Cathedral, New York. He also toured the country giving recitals. Yon was also a composer, most famous for his Toccatina for organ (also known as 'Humoresque - l'Organo Primitivo'), and his Christmas piece Ges bambino. He also wrote many works for organ, piano, and orchestra, including a Concerto Gregoriano for organ and a concerto for oboe.
Yon died in Huntington, New York in 1943. "Ges bambino" is an Italian Christmas carol composed by Pietro Yon in 1917. It was translated to English by Frederick H. Martens. The lyrics of the chorus are also the same as the lyrics in the chorus of O.