Both singin' in the rain and the wizard of oz include musical and dance numbers. how do the musical/dance pieces compare in the two films? which film makes better use of music and dance? why?

I think Singin' in the Rain has more song and dance, and it's better and goes along with the story. The wizard of oz, on the other hand, could have left out the singing and dancing and might have been a better movie. But in Singin' in the Rain, the music is what takes the cake to the movie, and just ties the whole thing together. Hope this helps! :)

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art. 

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.