91.9 WNRN near Charlottesville, VA regularly works in ads that are more like commercials. At the top of every hour, the on air person will say something like:
"This hour brought to you by ABC company. Visit ABC company at 1234 Main St or on the web at abc dot com. ABC, bringing you XYZ for over 20 years and now offering a Wednesday discount for all its loyal customers."
Of course almost immediately after this, they give the TOH ID and add:
"Bringing you commercial-free music."
Technically, I suppose they are commercial-free for all but the top of each hour.