“The musician - if he be a good one - finds his own perception prompted by the poet's perception, and he translates the expression of that perception from the terms of poetry into the terms of music.”
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It should here be added that poetry habitually takes the form of verse.
Any long work in which poetry is persistent, be it epic or drama or narrative, is really a succession of separate poetic experiences governed into a related whole by an energy distinct from that which evoked them.
Poetry is the communication through words of certain experiences that can be communicated in no other way.
For while the subjects of poetry are few and recurrent, the moods of man are infinitely various and unstable. It is the same in all arts.