Encaustic painting is an ancient technique created by the Greeks. It uses melted wax, originally bees wax mixed with pigments and then altered using resin, originally crystallized tree resin. It gives a very brilliant and long lasting effect. The wax with the pigment is applied to the canvas, wood or plaster and then heat is passed over the surface to create a uniform film. Resin is applied to alter the consistency is necessary. The wax is built up in layers and heated every time to give a rich optical effect and is time consuming and laborious.
An artist during the middle ages would choose another medium over encaustic painting because of how time consuming and laborious it is to do.
Music can make a change if it be social or government policy. Music has a way to express people's emotions. If it be listening to rock with your friends or hearing it Is Well with My Soul out of hymn book. Cultures are always changing and history is always repeating. Yes, music can make a change in a culture.