Juan Blas de Castro

Juan Blas de Castro (1561 – August 6, 1631) was a Spanish singer, musician and composer. Born in Barrachina, in the province of Teruel, Spain, he was the second of four brothers. In 1592, he became part of the court of the Duke of Alba in Alba de Tormes, Salamanca, together with his friend, the poet and playwright Lope de Vega. During his stay, he set to music several of Lope's poems.