Pls help What is serialism in music?

Visual art
Music in literature
Arranging musical pitches in a scale
Jazz composition

What is the importance of the american anti slavery society founded

Why did poland, hungary, and east germany join the warsaw pact? a)their people voted to join in free elections. b)their efforts to join nato failed. c)they wanted to stop the spread of communism in europe. d)they were soviet satellites that had little choice.

All of the following are reasons that rome was so strong and powerful except a. rome had excellent soldiers c. they were armed with a gladius and pilum b. they had legions d. they valued education and intellect