Apple released a relatively minor update to iTunes 11 this week, delivering mostly performance and stability improvements but also including one other small feature—the Composers View—that may be of particular interest to classical music fans with large, well-organized libraries.
The new view basically replicates the Artists View introduced in the initial release of iTunes 11, with a left-hand sidebar that allows you to browse music by composer instead.
Since it presumably would not be of interest to everyone, however, Apple chose to leave it disabled by default, but if you have a use for it, you can easily go and turn it on yourself with a quick trip into your iTunes Preferences—a new “Show Composers” checkbox now appears on the General page to allow you to toggle the feature on or back off again.