Hilarion Eslava (1807-1878) was a Spanish priest, musician, and pedagogue. Although he was a prolific and well-known composer in his own time, today he is primarily remembered for his 1846 work, Metodo De Solfeo , a successful Solfège Method which has been in constant use all over the world for more than 150 years. Having been a choirboy at Pamplona, the method was published while Eslava was choirmaster at the Royal Chapel in Madrid, and he undoubtedly used it as he was training the choristers there.