In the new iTunes, (11.0.2)
New iTunes is 11.0.4.
I want to have all of my music sorted by composer, not album, title, or artist. In older versions of iTunes, this was simple, just be double-clicking the name of the song, and adding the composer's name to the track if it wasn't there already.
This is sorting by title field (actually Name) (which had the compser name in it), not Composer field, which is a separate field.
Select Songs view.
iTunes menu View > View options.
Then click on the Composer field to sort by composer.