http://www.poetry.org/whatis.htm
“What is generally accepted as “great” poetry is debatable in many cases. “Great” poetry usually follows the characteristics listed above, but it is also set apart by its complexity and sophistication. “Great” poetry generally captures images vividly and in an original, refreshing way, while weaving together an intricate combination of elements like theme tension, complex emotion, and profound reflective thought. For examples of what is considered “great” poetry, visit the Pulitzer prize and Nobel prize sections for poetry.
The Greek verb ποιεω [poiéo (= I make or create)], gave rise to three words: ποιητης [poiet?s (= the one who creates)], ποιησις [poíesis (= the act of creation)] and ποιημα [poíema (= the thing created)]. From these we get three English words: poet (the creator), poesy (the creation) and poem (the created). A poet is therefore one who creates and poetry is what the poet creates. The underlying concept of the poet as creator is not uncommon. For example, in Anglo-Saxon a poet is a scop (shaper or maker) and in Scots makar.
Sound in poetry
Perhaps the most vital element of sound in poetry is rhythm. Often the rhythm of each line is arranged in a particular meter. Different types of meter played key roles in Classical, Early European, Eastern and Modern poetry. In the case of free verse, the rhythm of lines is often organized into looser units of cadence.”
How my heart sings 