Music and Poetry have ever been acknowledged Sisters, which walking hand in hand support each other; As poetry is the harmony of words, so music is that of notes; and as poetry is a rise above prose and oratory, so is music the exaltation of poetry. Both of them may excel apart, but sure they are most excellent when they are oined, because nothing is then wanting to either of their perfections.

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Source, in full

Henry Purcell, ‎Edward Taylor (1843) in "Introduction" to, King Arthur: an opera in 5 acts, written by John Dryden. p. 3; Introduction; Cited in: James Anthony Froude, ‎John Tulloch (1852), Fraser's Magazine, Vol. 45, p. 198

Attribution

Quote text and notes from Wikiquote: Henry Purcell (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.