burst into song

Crucially she says they wanted the show to be relatable and feel real, or as real as a show can be when the characters spontaneously burst into song.

Clustered in a dank, darkened corridor offstage, members of the chorus drew themselves up, preparing to burst into song.

“I was writing a scene one day and a character burst into song,” Guild says.

This from a character who invents a chocolate that makes people burst into song!

President Recep Tayyip Erdogan burst into song as he claimed victory in his country's election.