Can you answer this week's Secret Theme questions?

Can you figure out the themes in each group of 10 answers that link each group of otherwise unrelated trivia questions? Solutions will be posted later this week.

Ray's:

1) What 1987 U2 album, which went Diamond in sales in the US (10 million+ copies sold), also generated 3 Top 40 singles?
2) What 1973 film starred Martin Sheen as Kit Carruthers and Sissy Spacek as Holly Surgis?
3) What anti-Semetic forgery was likely written by Matvei Golovinski in the 1890s?
4) What 1973 pop-folk song, which went Top 10 in the US that year, was officially adopted as a co-state song of Colorado earlier this year?
5) Which US president is said to have coined the "Good to the last drop" ad slogan for Maxwell House coffee via an off-hand remark?
6) Who is Juan Diego Cuauhtlalatoatzin famous for having supposedly met in December of 1531?
7) What's the Spanish word for "turtle"?
8) What was founded by Pierre de Fredy, Baron de Coubertain in 1894?
9) Mike Oldfield's 1973 album Tubular Bells was the first album released on this prog-rock label in 1973, owned by British billionaire Richard Branson. Name the label.
10) What American record label, with an architecturally distinct HQ in Los Angeles, was founded by songwriter Johnny Mercer in 1942?

... and what theme links the 10 answers?

Frank's:

Owing to an inexcusable brainfart on my part, question #9 below is not actually related to the theme. I can't tell you how that is now without giving away the theme, so I'll explain it when I post answers later this week. Two teams at Frank's did nail the theme with less than 9 correct answers. You might as well still try to answer all 10, just don't let #9 throw you; ignore it.

1) What's the 8th letter of the Greek alphabet, situated between eta and iota?
2) What San Francisco-based pop combo had 5 Top 40 singles in the period 1977-1981, inluding their biggest hits "Love Will Find a Way" and "Don't Want to Live Without It"?
3) Where do the Philadelphia Phillies hold spring training?
4) In Euclidian geometry, what do you call a segment of the perimeter of a circle? (There's actually a much more complex mathematical definition for what I'm looking for more generally, but this works just fine.)
5) What sit-com actress was married to former teen heartthrob Parker Stevenson 1983-1997?
6) Who played sadistic bully Billy Nolan in the 1976 film Carrie?
7) What singer, songwriter and producer won his third Grammy for his classic 1971 album Black Moses?
8) What nursery rhyme is said to be a disguised retelling of the refusal of Cardinal Wolsey to grant Henry VIII a divorce from Catherine of Aragon?
9) What prog-rock band did Steve Howe join in 1971?
10) What 1994 film stars Harrison Ford as CIA agent Jack Ryan?

... and what theme links the 9 answers (ignoring question #9)?