The players form a circle. One player goes into the middle of the circle and starts to sing a song and the other players try to join him. If one of the surrounding players happens to sing a song somehow related to the current one (in lyrics, melody, or mood, or a song he just has an association too) then that player replaces the player in the middle and starts to sing the new song.
Important: The game must be played rapidly so that there is a continuous stream of songs. If the singer in the middle does not know how to continue singing he/she should be replaced quickly.