music: 80's Chart Toppers: Name The Artist: So Emotional?

Questions

Young Creatures (Australian)?

Zappa song : "Billy was a mountain/Ethel was a tree sitting on his shoulder"?

1972: "Black & White" was a hit for who?

1972: Helen Reddy pronounced this to the world.?

1972: Name 1 of the 2 artists who shared the title of 1972 #1 sigles artist?