What is the difference between unity and variety?

Variety is the use of different visual elements throughout a work, whereas unity is a feeling that all the parts of a work fit together well. These do not have to be opposites, as a work filled with variety might also have unity.

  250,000 to 10,000

Trumpets, saxophone, trombone, flute, french horn  mostly in jazz or classic.  you can answer the rest thats on your own honestly