Abosching
Abosching is when a person is speaking and then breaks into song, particularly in musicals. The term is also used to refer to the point at which the speaking stops and the singing starts.
In West Side Story, the character Riff is talking to the rest of the Jets, when suddenly he Abosches into the song "cool".
In Wicked, Elphaba does some good Abosching.
In Wicked, Elphaba does some good Abosching.