Simplify the following text for a Grade 9 native English-speaking person.
Original: Early chansons tended to be in one of the formes fixes -- ballade , rondeau or virelai ( formerly the chanson baladÃ e ) -- though some composers later set popular poetry in a variety of forms .
Simplified: They had various forms , including ballade , rondeau and virelai . Some composers at the time liked to set popular poetry to music .