Sing
From MUME
If you want to sing to all the other players in the game, sing it with the command 'sing <argument>'. You can choose whether to receive songs or not from other players by using the command 'listen songs'.
NOTE: The effort you make when communicating with other players on a global level takes its toll. Singing reduces your movement points.
NOTE: A 'sing' without any arguments is a social command.
Example:
> sing Oh, Elbereth!
