1) Whether or not you should get muted depends on your mic-quality and if you are purposely singing in a way to be a nuisance (overly loud and irregularly pitched).Questions:
You're on turbine and I ([U:1:106005514]) and start singing too DavidtheTurkey, how do you proceed?
You see a picture of Ash from Pokemon, naked, sprayed by [U:1:12345678] how do you proceed?
If your mic and song quality is not staticy, breaking in-and-out, etc, I would use sm_csay to tell people to client mute you at their leisure.
If your mic and song quality is not up to par and carries on for too long/you do not listen to my warnings: I would proceed by opening up the server's ID listing by typing status into console. Then I would extract your ID (which is [U:1:106005514] ) and quickly use it to check your offenses. And accordingly to your offenses I would have to mute you. (sm_mute "#[U:1:12345678]" (time) "Server disruption via Mic (bad singing)")
2) I never watched Pokemon, and I don't know if they we're adults or not. But it looks shotacon enough to me. I would proceed to ban him accordingly to his offenses (after extracting his ID and searching offenses in SourceBans) - sm_ban "#[U:1:12345678]" (time) "Use of illicit child pornography in spray "