Madrigal
When Italian composers started writing madrigals the kinds of songs they knew were the frottola, the motet and the French chanson (song). The first madrigals were for 2 or 3 voices, but later many madrigals were written for 4 or 5 voices. These voices might be single voices (one person to each part) or several people. Sometimes the lines would also be played by an instrument, but the madrigal is usually sung unaccompanied.