Earlier this month, Apple removed the free 'single of the week' that had been a part of the iTunes store for 11 years. I even got a little sentimental about it. Today, Mike Beasley reported on 9to5Mac that Apple added a new 'Free on iTunes' section featuring singles and TV shows.
However, I distinctly recall a 'Free on iTunes' section. Sure enough, I came across this 2011 post on TechHive confirming the section (the link in the article still points to a different section highlighting free content). I'm guessing that this section got buried for a while and is now being updated and revived.