A doorbell-- so that is what that is. Every time we go to look for where
that music is coming from, somebody comes to the door! Seriously, can
you find any wires going to the doorbell swich, and to the bell itself.
If you can find either, trace it down and it should lead you to the
tranformer. If the transformer is in a spot that is too hard to access,
just go buy a new one-- only a few dollars- and hook it up to a constant
source of 120 volts wherever is easiest. One low voltage wire from the
transformer will go straight to the bell, and the other to the switch
and then back to the bll. Good luck Larry