What 1968 hit was the first song to use the phrase "heavy metal"?

More Questions:

In what decade did the Vatican withdraw their requirement that Catholics refrain from eating meat on Fridays?

A cat-o'-nine tails is a type of what?

How many of the engines can a 747 pilot see from his cockpit window?

What ballet term translates literally as "in Arabic fashion"?

What is the only African country whose common name is only one syllable?

Angel Falls, the highest waterfall in the world, is located in what country?

Gunpowder, paper, and soy sauce were all invented in what country?

What disease was once nicknamed "the white plague"?

With what is sulfur and saltpeter mixed to make gunpowder?

Gene Kelly sings "Singin" in the Rain" over the end credits of what 1971 movie?

What Looney Toons cartoon character often used the catchphrase "Thufferin" Thuccotash"?

What was Bobby "Boris" Pickett's backing band?

What is the name of the town where the Sons of Anarchy have their motorcycle club?

Which former First Lady cowrote the Declaration of Human Rights which was adopted by the United Nations?

Joe Louis became World Champion in which year?