"Twenty-five culturally diverse films produced between 1901 and 1991 have been selected for inclusion in the Library of Congress's National Film Registry, bringing to 350 the number of films that will be preserved for posterity by the federal government. The films represent significant transformations in the cinematic art and include the Gene Autry "singing cowboy" film 'Melody Ranch', the urban gang drama 'Boyz N the Hood,' the "mockumentary" 'This Is Spinal Tap,' the Bruce Brown surfing movie 'The Endless Summer,' and one of the first experiments with sound-on-film, the 1925 'Theodore Case Sound Test: Gus Visser and His Singing Duck.'"
--From the IMDB
I can't read the topic title without singing the chorus to "Rock Of Ages"...
Dude! I told you. Spinal Tap is the bomb :-)
..."Rock Of Ages" is a Def Leppard song...
Here's some others that made the list--but not the IMDB article I quoted. Wow! Can you believe the IMDB didn't mention these?
"Alien"
Disney's "Beauty and the Beast"
"The Black Stallion"
"From Here To Eternity"
"In The Heat Of The Night"
The Three Stooges' "Punch Drunks"
...and the original "Sabrina."