I know WLOF did a singing EBS Test in the late 60s. It was airchecked and circulated around a lot. Considering the FCC's dead-serious attitude toward EBS, that was pretty outrageous... sort of a "test" of the FCC's tolerance, and definitely typical of the always off the wall Channel 95.
I don't remember them doing a sponsored EBS. That would seem surprising for that station. Are you sure you might not be confusing another station's sponsored EBS with 'LOF's singing EBS Test, BIG APE?