The German Chancellor, 63, appeared to be letting off steam at the campaign event in Berlin with German jazz singer Uschi Brüning.
Mrs Merkel appears determined to pull in votes for the upcoming elections on September 24 in any way possible – even revealing her singing chops to do it.
In the video, posted on Twitter, the German Chancellor can be seen sitting in the audience.
But when handed the microphone by the singer, Uschi, she enthusiastically sings along to a tune called ‘Strange Things Happen Everyday’.
Sitting in the front row of the event and wearing a blue suit, Mrs Merkel grooves along to the live band on stage.
Uschi sings before suddenly Mrs Merkel moves closer to the microphone to sing the echo “every day, every day”.
As the usually stiff leader of the Christian Democratic Union sings, the crowd looks on and continues to clap along to the song.
Uschi exclaims: “No, nobody believes me. I can sing with the Chancellor. Where is only television? Where is the television?
Then Merkel does it again and is met with a round of applause by the crowd.
Uschi, a popular German singer, forged her band from the former German Democratic Republic in 1975.
The CDU campaign event was held in a turn-of-the-century corner house that had been hired to publicise the party’s victories, German magazine Cicero reports.
Among the issues on the agenda was how to make Germany accessible to all voters.
Mrs Merkel is poised to win a fourth term in the national election, as her party has a double-digit lead over the Social Democrats, junior partners in the ruling coalition.
After 12 years in power, the Chancellor is presenting herself as more than just Germany’s ‘Mutti’, or mother, campaigning in cyberspace to get in with younger voters and win their support for long after elections this month.
But she may not win enough votes to get her party overall control as a growing number of voters back her rivals leaving her without a clear majority.