Why are artists like leonardo da vinci, michelangelo, and raphael considered some of the greatest artist ever?

What are the letters of the line in the typical cliff in order from bottom to top of the staff

Which style of polyphony uses a borrowed chant and arranges several new melodies and texts above and unrelated to the chant?

The energy applied to cause vibration can be in the form of air pressure a stick, bow, or electricity. true or fasle