are there any web information files about the filming of the Sound of
music, or about
behind the scenes and gossip from the actors? If yes, where can I get them?

Thank you for your question. Yes, there are a lot of sites containing
behind-the-scenes information for the Sound of Music. The best I could
find is an unofficial site, "The Sound of Music". Click on ?TRIVIAS?
at the top of the page:

http://www.soundofmusic.de.ms/

The site also hosts The Sound of Music Forum at
http://soundofmusic.proboards20.com/

where you can read & post messages about the film.

The official Fox site 
http://www.foxhome.com/soundofmusic/

has a few items that might be of interest: see

"The Story of The Sound of Music: Behind the Scenes"
http://www.foxhome.com/soundofmusic/sto/stob.html

and another unofficial site, "The Sound of Music"

http://www.geocities.com/Hollywood/Screen/5208/SM.html

has some background information - page down to the ?Did you know? section.

"My Favourite Things" at
http://www.myfavouritethings.homestead.com/themovie0.html

has links to trivia and other background info.

The Seattle Times reports on Sound of Music tours at:
?The Seattle Times: Travel: Austria: Salzburg's hills are alive with
'Sound of Music' fans?

http://seattletimes.nwsource.com/html/traveloutdoors/2001416011_soundmusic10.html


A book you might find of interest is "The Sound of Music" by Julia
Antopol Hirsch & Robert Wise. Amazon has it for sale at:

http://www.amazon.com/exec/obidos/tg/detail/-/0809238373/103-0793718-0495826?v=glance

It is described as ?A complete behind-the-scenes history of the
filming of the beloved musical classic?

The DVD also contains behind-the scenes information: see
?Amazon.com: DVD: The Sound of Music (Five Star Collection) (1965)?
http://www.amazon.com/exec/obidos/tg/stores/detail/-/dvd/B00003CXCS/glance/103-0793718-0495826

Information courtesy of the Internet Movie Database is at
?Amazon.com: Quotes & Trivia: The Sound of Music (Five Star Collection) (1965)?
http://www.amazon.com/exec/obidos/tg/detail/-/B00003CXCS/103-0793718-0495826?v=glance&vi=quotes-trivia

I hope this is of interest to you. Please don?t hesitate to request a
question clarification if you require further information.
Kind regards

blackbird-ga

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Google search strategy:

?sound of music? ?behind the scenes?
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I am very pleased for the answer