There are no reversions. However, nothing new will go into the Public Domain for another 20 years. Laws that govern Public Domain differ from country to country. The information provided above applies to the Public Domain in the United States. The book's emphasis is on popular music and includes selections by Berlin, Kern, Gershwin, et cetera.
Listings are by title and category.
Categories include Popular Music, Christmas Music, Classical Selections, Children's Songs, Folk Songs, International Favorites, Songs for Special Occasions, Marches, and a whole lot more - much more. The book contains death dates for composers which will enable users to determine the copyright status of the compositions throughout the world. Encyclopedia is a handy, terrific resource.