Melopoeia is a term Ezra Pound used for poetry that works through sound, rhythm, and musical cadence as much as through meaning. A poem with strong melopoeia depends on the music of its language to shape feeling, especially when it is spoken, chanted, or sung.
It is one part of Pound's threefold idea of poetry, alongside phanopoeia (imagery) and logopoeia (the play of intellect and word choice).
Example
The rain kept time on the roof at night
soft, quick, and steady as a drum;
I heard the dark before I saw it,
and sleep arrived to that small hum.