Misc: during wwii, americans tried to train ---------- to drop bombs?

Questions

In 1970, they became the first rock group to play NYC's Met. Opera House?

In 1973 Deep Purple released this popular double live album here in the U S?

In 1977, who recorded "Barracuda"?

In 1982 which group declared they were 'hungry like the wolf'?

In 1982, who recorded the lp called "The Number of the Beast"?