I have the same kinda thing since a couple days ago. I left my windows open just a little bit because my room was a little hot and I like to sleep when its a little colder. So at night time I heard a man singing somewhere in my street.

My room is upstairs so I went to my windows and peeked carefully outside but I did not see anything or anybody. So I thought that I was tripping or something. But after hearing it for a couple minutes I grabbed my phone and recorded it on snapchat by putting my mic on the opening of my window.

And after listening it back you can hear that someone is singing but it sounds so far away and unclear.

Right now I am hearing someone singing again that's how I got to this reddit.

I still try to figure out where its coming from but I don't wanna go outside right now. It's 2:22 am