Simplify the following text for a Grade 5 native English-speaking person.
Original: In Medieval music , instruments are divided in two categories : loud instruments for use outdoors or in church , and quieter instruments for indoor use . Many instruments which are associated today with popular music used to have important roles in early classical music , such as bagpipes , vihuelas , hurdy-gurdies and some woodwind instruments .
Simplified: Classical music can be for instruments or for the voice .