A verse letter

One word substitute is Epistle.

Epistle: a letter.
Epitaph: a phrase or form of words written in memory of a person who has died, especially as an inscription on a tombstone.
Pantomime: a theatrical entertainment, mainly for children, which involves music, topical jokes, and slapstick comedy and is based on a fairy tale or nursery story, usually produced around Christmas.
Lay: put (something) down gently or carefully.