I'll wait until 11, in case someone did answer it and the answer simply disappear. Or if someone wants to jump in. It's easy to Google this one.

It's Haeftling in Berlin:

http://www.haeftling-shop.de/oscomme...hp?language=en

I'll try to think of a clue to post.

Clue: The battle of (8 letters) marks an important turning point for (city: 6 letters) against (people: 8 letters).

Call the three blanks to be filled in (a), (b) and (c), respectively.

(a) is also a term used to describe a (long) (event: 4 letters).

(c) is also the title of a (genre: 4 letters) by (author: 9 letters).

6th letter of (c) = "a".

Battle of Marathon (what event? a walk?)
Athens & Persians (a play by Aeschylus)?

Oh, I guess a race (marathon)

Well, a race (!) of course.

We just had the NYC Marathon on Sunday, as you know.

So you get the next clue. I thought this one would take a little longer. Guess not.

This classical musician (trying to be vague) was most famous for his interpretation of the music by (composer: 4 letters).

He later moved to this town (6) in this country (6) due to a self-imposed exile. The town hosts an annual festival (which bears his name) that was started by him over half a century ago.

He performed at the White House for 2 different presidents , almost 6 decades apart.

There are two museums honoring him, one at his birthplace (town: 8), and one where he died (town 2 words: 3,4).

Name:
Musician: 5,6 ("a" = 2nd of first name)
Composer (whose work he was most famous for): 4
Town he moved to after self-imposed exile (where the annual festival takes place): 6 ("a" = 3rd)
Birthplace: 8
Place he died: 3,4

"a" from Athens

I'm guessing this is Pablo Casals, known for the Bach Suites, but I need to check.

Get the rest here:

http://www.bach-cantatas.com/Bio/Casals-Pablo.htm

b. Ventrell, d. San Juan, festival at Prades.

Geez. You are too smart for my clues!

He played for both Roosevelt (1904) & JFK (1961). Read about it yesterday when I visited the Sixth floor museum.

What Sixth Floor museum?

I didn't know that he played for Roosevelt, actually.

I think that some of his recordings were made at the Library of Congress, but I'm not sure if they're easily available.

Welcome to the heart of the Red States.
http://www.jfk.org/

Wow. Didn't know there's such a thing! (I had read that the space was converted to a museum, I guess, but didn't know that that was the name.)

Clue: This mythological animal (4 letters) appears in the title of a piece of music by (composer: 7), which starts with a solo for this instrument (5 letters).

The composer, while composing the piece, was influenced by the poet (8 letters).

A house located in this site (7 letters) is also identified by a sculpture of the animal that appears in its courtyard. The original sculpture is located in this city: 6 letters.

You forgot to post the letter clue?

Answers to your clue:

Faun
Debussy's Prélude à l'après-midi d'un faune
flute (I did have to listen to it to figure it out)

House of the Faun in Pompeii
Naples

Oh, forgot about the poet:
Mallarmé

Yes. But well, I guess you didn't need the letter hint anyway.

This park (name: 10, park) in this non-European city (7 letters) features works by several artists/architects.

One is a concert venue, designed by (5) and named after a famous person (last name:8) (who created a prize with the same name)

Another is a bridge, designed by the same person who designed the concert venue. It is the only bridge designed by him (so far).

One other attraction is a fountain by (last name: 6)

There is also a sculpture by (last name: 6), born in (city: 6)

Park: 10, park ("e" = 5th letter)
City: 7
Concert Venue name: 8
Designer of concert venue & bridge: 5 ("e" = 2nd)
Fountain designer: 6
Sculpture designer: 6, born in: 6

"e" from Debussy

Millennium Park in Chicago

Concert Venue = Pritzker (Pavillion), designed by Gehry

Plensa's Crown Fountain:

http://www.lynnbecker.com/repeat/Gehry/plensa.htm

Kapoor's sculpture:

http://www.lynnbecker.com/repeat/Gehry/kapoor.htm

Born in Bombay:

http://www.lisson.co.uk/theArtists/K...ishkapoor.html

Clue: This building was converted into a museum (name: 4, 6) by (nationality: 5) architects 1 & 2 (architect 1: 6, architect 2: 2, 6). Its (place: 7, 4) houses a rotating series of commissioned art works.

last letter of 2nd word of "place" = "l."