Sharing a video on Twitter on Thursday, Mr Catney said he “couldn’t help a surprise serenade”.
“It might be miserable outside but as long as you’ve a song in your heart, you can get through the day,” said the former pub owner turned politician.
In the 44-second clip, Mr Catney had the crowd singing along before shouting “that’s it folks”.
Replying to the post, BBC Radio Ulster’s William Crawley said, “that’s some voice!”
Other users also complimented his singing voice, while Brian O’Criochan added: “Pat… just bring out the album.”
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