Category:Compositions by composer should be standardized by renaming most of the subcategories. As you can tell from the red links, I haven't added the new categories yet; I can do this manually if asked.
- Category:Bach compositions -> Category:Compositions by Johann Sebastian Bach
- Category:Bartók compositions -> Category:Compositions by Béla Bartók
- Category:Beethoven compositions -> Category:Compositions by Ludwig van Beethoven
- Category:Leonard Bernstein compositions -> Category:Compositions by Leonard Bernstein
- Category:Brahms compositions -> Category:Compositions by Johannes Brahms
- Category:Chopin compositions -> Category:Compositions by Frédéric Chopin
- Category:Copland compositions -> Category:Compositions by Aaron Copland
- Category:Dvorak compositions -> Category:Compositions by Antonin Dvorak
- Category:Gershwin compositions -> Category:Compositions by George Gershwin
- Category:Haydn compositions -> Category:Compositions by Joseph Haydn
- Category:Mahler compositions -> Category:Compositions by Gustav Mahler
- Category:Mozart compositions -> Category:Compositions by Wolfgang Amadeus Mozart
- Category:Poulenc compositions -> Category:Compositions by Francis Poulenc
- Category:Prokofiev compositions -> Category:Compositions by Sergei Prokofiev
- Category:Erik Satie compositions -> Category:Compositions by Erik Satie
- Category:Schubert compositions -> Category:Compositions by Franz Schubert
- Category:Ravel compositions -> Category:Compositions by Maurice Ravel
- Category:Robert Schumann compositions -> Category:Compositions by Robert Schumann
- Category:Scriabin compositions -> Category:Compositions by Alexander Scriabin
- Category:Shostakovich compositions -> Category:Compositions by Dmitri Shostakovich
- Category:Sibelius compositions -> Category:Compositions by Jean Sibelius
- Category:Richard Strauss compositions -> Category:Compositions by Richard Strauss
- Category:Tchaikovsky compositions -> Category:Compositions by Pyotr Tchaikovsky
- Category:Wagner compositions -> Category:Compositions by Richard Wagner
See also: Category talk:Compositions by composer