Instrumentally Speaking...

A poem, in my opinion, is opposed to a work of science by having, for its immediate object, pleasure, not truth; to romance, by having for its object an indefinite instead of a definite pleasure, being a poem only so far as this object is attained; romance presenting perceptible images with definite, poetry with in definite sensations, to which end music is an essential, since the comprehension of sweet sound is our most indefinite conception. Music, when combined with a pleasurable idea, is poetry; music without the idea is simply music; the idea without the music is prose from its very definitiveness.

What was meant by the invective against him who had no music in his soul?

- E.A. Poe, "Letter to Mr. B-"