Madrigal (Latin: madrigal=something simple)
Poem written to be set to music.
Usually about love.
Short and simple.
2 or 3 Tercets (3 line verses), followed by 1 or 2 rhyming Couplets (2 line verses) with all lines containing 7 or 8 syllables
Today, form is looser, retaining only the rule of the final rhyming couplet.