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.
Since a copyright renewal has to be sometime in the 28th year, you'd look for renewals in the records for the original copyright date plus 27 years and the original date plus 28 years. So if the copyright was originally 1941, you'd look at the volumes for 1968 and 1969 to see if there was a renewal.nother way that doesn't involve an exhaustive copyright record search is to write to the author, or their agent or estate, or to the last publisher of the book, and see if they can tell you whether the book's copyright was renewed.