Cat's can't sing

Poor old Oscar from next door.  He is completely stressed at the moment.  The ginger gentleman keeps calling round with his intact furry dice and attacking him, there is a new dog in the house that keeps attacking him, and every time he finds a good cubby hole in our garden it moves - OH said that when he moved the desk to take it to the tip Oscar shot out like he had been fired from a cannon. 

He's been 'singing' on the fence, a sort of mournful owww-owww-owww that sounds ever so sad and lonely.  Our old psycho cat used to 'sing' it as well, usually with a sock in his mouth because he was quite insane and couldn't be trusted around hosiery.  The first time I heard it I was searching for evil cat in case she had been trapped outside, but she was safely snoozing.

I am well aware that cats often 'sing' at night.  The pitiful owww-owww-owww is so haunting (and completely disruptive to sleep - extra points for the cat).  However Oscar 'sings' in the afternoon.  It is entirely possible that he is now scared of the dark.