Can you figure out this week's Secret Themes?

Each group of 10 otherwise unrelated questions has a theme running through their answers. Can you answer the questions and figure out the theme? Answers will be posted in a few days.

Ray's Happy Birthday Bar:

1) What British marching song, written in 1914, came to the attention of Americans via a 1957 film which won several Academy Awards?
2) What's usually the translation of the preposition "by" in French? It's the word you would use in French to denote, for example, the author of a book.
3) In 1994, bassist Kristen Pfaff overdosed shorty after the release of a successful album by her rock band. Name the band.
4) What Peruvian folk tune was recorded by Simon & Garfunkel in 1970?
5) In German-speaking countries, this suit of playing cards is called "Acorns." What do we call it?
6) How many planets are in between our sun and our solar system's asteroid belt?
7) What British author wrote "The Quiet American" and "Our Man in Havana"?
8) What 1991 movie starred Robin Williams, Dustin Hoffman and Julia Roberts?
9) As best as geologists can determine, Earth's core is comprised of 80-100% of what element?
10) What line of fruit-flavored carbonated beverages was introduced by PepsiCo in 1984 and has been phased out 2003-2007?

... and what theme links the 10 answers?

Dirty Frank's:

1) What American general was famous for capturing Fort Ticonderoga in 1775?
2) What comic book character has a girlfriend named Gloria Glad?
3) Name the American city: 22nd largest in population, has the nickname Cream City, founded in 1818 by a Frenchman named Solomon Juneau. Note that the answer is not Juneau.
4) What NHL franchise is in the Western Conference/Pacific Division and joined the league in 1991?
5) What quarterback was selected 2nd overall in the 1985 NFL draft and won the Maxwell Club's Bert Bell Award for outstanding professional football player in 1990?
6) The 1896 Yukon Gold Rush is also known by another name; what?
7) In what 1991 movie did John Goodman play an American slob who inherits a British royal title?
8) What sociologist is famous in part for publishing The Protestant Ethic and the Spirit of Capitalism in 1905?
9) Who was famously executed on May 30, 1431?
10) What British band had 5 Top 40 singles in the US 1981-1990, the best selling being 1987's "When Smokey Sings", which went up to #5?

... and what theme links the 10 answers?