January 2018
After playing for a while, if I start practice singing with someone at level 1 singing, speed up time, and then tell them to stop, they will and go away...but the spot they were at keeps singing. Saving and closing application doesn't fix it, only shutting down my console for 10 minutes to clear cache and coming back does. Before I figured this out, I had to MOVE to get away from the nonstop terrible singing!!!!
January 2018 - last edited January 2018
If the sims are stuck doing something, you should be able to reset them using resetsim firstname lastname. you might have to use testingcheats true first, unsure. This normally also resets stuff they were interacting with, if the singing counts as that.. xD
January 2018
Lecrone, you could try resetting the object, too! But CMeki is right, you do have to have cheats enabled.