My favorite example is a Barbara Mandrell's song from her 1979 LP "Just For The Record." On the cover, a 31 year old Barbara is sporting a sequined little dress that would have gotten her pass the velvet ropes at any Nashville discotheque. On the whole, the album is her blend of country with a little pop and soul (heavier on the pop than soul.) But a little song, Is It Love Yet, hidden on track 3 on side 2, is so catchy it could get stuck in one's head for close to 30 years and forever break the common wisdom that country music doesn't groove outside a line dance.
I put together this little video to illustrate. It starts off with a rhythmic lead in and then rides a slight but defined drum/dance beat and accented with backup singers throughout. In the video, I've noted the specific disco references at about 1:24 and around 2:20. To set the mood, the video includes a disco ball and go-go boys.
Babs was not the first artist to take this route, Dolly Parton had a fair amount of success with danceable country songs like Baby I'm Burnin' (#25 in 1978 on Hot 100 charts). Nor was Mandrell the last. In 1991, Tammy Wynette had a #11 hit with KLF doing Justified and Ancient. And today, all Leann Rimes songs are better after they've been reworked and remixed.
Barbara went on to win two Grammy's, have a top 10 TV Show, six #1 country singles, and perhaps the only person to appear on both Hee Haw and Baywatch.
As far as I know, "Just For The Record" was never released on CD and certainly not available digitally. LPs and 8-tracks can be found on the ebay.
Download the MP3 here: Is It Love Yet?