Final answer:
Pythagoras believed in the power of music and its connection to the universe. He taught that each planet produced a note as it moved, creating a perfect harmony known as 'the harmony of the spheres.'
Step-by-step explanation:
Pythagoras, a Greek philosopher, believed in the power of music and its connection to the mysteries of the universe. He believed that the universe operated according to mathematical laws and that these laws could be revealed through music. Pythagoras taught that each planet produced a note as it moved, creating a perfect harmony known as 'the harmony of the spheres.'