Dissonance

Dissonance is a term that describes, in art, things that don't normally sound "good" or "pleasant" or "harmonic" with one another.

In poetry, the sounds certain vowels or vowel patterns make, "rhyme" with one another, or simply are "compatible" and work well with one another.

Walt Whitman's poem, "The Dalliance of Eagles" is one of the most oft-cited examples of dissonance:

Skirting the river road, (my forenoon walk, my rest,)
Skyward in air a sudden muffled sound, the dalliance of the eagles,
The rushing amorous contact high in space together,
The clinching interlocking claws, a living, fierce, gyrating wheel,
Four beating wings, two beaks, a swirling mass tight grappling,
In tumbling turning clustering loops, straight downward falling,
Till o'er the river pois'd, the twain yet one, a moment's lull,
A motionless still balance in the air, then parting, talons loosing,
Upward again on slow-firm pinions slanting, their separate diverse flight,

She hers, he his, pursuing.

http://answers.yahoo.com/