Juan Crisóstomo Jacobo Antonio de Arriaga y Balzola was a Spanish Basque composer. He was nicknamed "the Spanish Mozart" after he died, because, like Wolfgang Amadeus Mozart, he was both a child prodigy and an accomplished composer who died young. They also shared the same first and second baptismal names; and they shared the same birthday, 27 January.

François-Joseph Fétis was a Belgian musicologist, critic, teacher and composer. He was among the most influential music intellectuals in continental Europe. His enormous compilation of biographical data in the Biographie universelle des musiciens remains an important source of information today.