Does art have to be beautiful? Why or why not?

The five possible reasons explaining why art may be created are

Suppose that you are in a room with 3 doors and a crack in the ceiling for light. that is all. the doors each have a sign on them that says what there is behind them. door #1. a pool of corrosive acid. door #2. a crocodile that hasn't eaten in 8 months. door #3. a solar "oven". a giant lens that focuses all the sunlight at the entrance of the door. you must choose a door, which door do you choose?

Sacred music in the middle ages was mostly vocal in nature with little instrumental use, if at all. was this approach also true of secular music? .