Folk Music: British isles and america, often has a simple instrument accompaniment, usually on guitar. sometime folk songs are sung a cappella. often in verse form they don't always have a chorus.
the lyrics tend to tell a story (political, moan about the country or something)
a musical example of folk music.
Lily Rosemary and the jack of hearts, they tell a story.
Madrigal: a part song for several voices, typically arranged in an elaborate counterpoint and without instrument accompaniment, influenced strongly by text.
popular in the 14th century, originated in Italy, type of song for a small group of singers (no more than about 6) not religious pieces of music though they may sound it they are secular, (tend to have a lot of falalalalalalala's)