The most important american composer of tone poem was

Horatio Parker was the most important American composer of tone poem.

Horatio William Parker was an American composer, organist and teacher. He was a central figure in musical life in New Haven. Horatio Parker was a symbolic person remembered as the teacher of the great Charles Ives, who was one of the most famous and highly esteemed composers in the English-speaking world. Horatio Parker wrote two symphonic poems, A Northern Ballad and Vathek.

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