Thanx Lindal (and all) "You can also go into World>Parcel Details>Sound and limit sounds and voice to your particular parcel. This will help keep peace with the neighbors. Ask them to do the same, if the sound is coming from them or something on their parcel." got me thinking in the right direction.
I couldn't find the specific stream in any of the preferences. So it was random YouTube stream I think coming from another home, maybe? I actually went into Play/pause on the menu bar, selected it, stopped it and turned the volume completely down and that seems to have worked. I couldn't find the specific stream in any of the preferences.