A narrative poem that tells a story through dialogue and action -

Ballad:
A narrative poem that tells a story through dialogue and action. Its general features are:
- It is narrative in form, and so, it tells a story.
- Its narrator is generally impersonal third person.
- It opens dramatically at the middle of the story.
- Its story is told in dialogue and action.

Elegy:
A lyric poem mourning for the death of an individual or lamenting over a tragic event.
Ode:
An exalted lyric poem that begins with an address to someone, instil anguish in the middle part and ends with consolation.
Lyric:
A short poem expressing personal or subjective thoughts and intense feelings of a single speaker. It is identical to a song sung with a lyre.

Source: An ABC of English Literature - Dr M Mofizar Rahman