Many thanks to SWLing Post contributor, Tom Gavaras, who shares the following recording of Radio South Africa which was originally recorded on December 31, 1977 from his home in Plymouth, MN using a Hammarlund HQ-180.
During the late 1970s, Radio South Africa (RSA) would broadcast a New Years call-in show. This recording is from 1/1/1978 (12/31/1977 in the US). At two minutes into the recording, you can hear the interval signal for RAI (Italy) in the background. I have scoped (edited) the music. Unsure how long RSA carried on this tradition, but heard a similar call-in broadcast the following year on 1/1/1979.