People who live downstairs from a rock fan may not be in the mood, bu the Library of Congress is celebrating the 100th anniversary of the invention of the phonograph in an exhibit running through September 30. It all started with tinfoil, as the exhibit shows through Thomas Edison's workbooks, patent and a model of his original machine. With recordings, catalogs, and advertisements, the phonograph's path is traced to the LP record. The path winds through some interesting sounds: the earliest know recording of an American Indian, a campaign speech by Woodrow Wilson, Enrico Caruso at the microphone, George Gershwin at the paino, Charles Lindbergh's sppech which launched the space age and the dixieland Jazz Band's recording that launches the jazz age. They are all available to hear in listening booths.

A Wonderful Invention: A Brief History of the Phonograph from Tinfoil to the LP. Library of Congress, Great Hall, 1st Street and Independence Avenue SE. July 18 through September 30. Open Monday through Saturday, 8:30 a.m. to 9:30 p.m.; Sunday, 11 a.m. to 6 p.m. Free. 426-5000. CAPTION: Picture 1,[WORDS ILLEGIBLE]; Picture 2, Thomas Edison Photographs courtesy of the Library of Congress