Debussy wanted to distance himself from what he considered the emotional excess of the Romantics and instead wanted to write music that, through sound, created an ambience similar to that of the Impressionist painters and Symbolist poets of his day.
All books initially copyrighted in the US from 1964 through 1977 have had their copyrights automatically renewed (by law) and the copyrights are still in force. The initial copyright term was 28 years; the renewal was for 67 more years.
To copyright your book, place a notice on the copyright page. Either the word copyright and/or the copyright symbol must appear along with the year of first publication and the name of the copyright owner, such as Copyright 2016, Bill Shakespeare, All rights reserved..