karaoke graffiti

karaoke: a form of entertainment, in which individual members of the public sing.

graffiti: a form of vandalism involving painted text or images in public places.

karaoke graffiti: a form of art, in which individual members of the public paint song lyrics in public places.

One graffiti artist sang a karaoke song, while painting the song lyrics in a mural. That artist created "karaoke graffiti."