This happened about three years ago at my parent's rented home; an older one story with a basement that sits on the edge of a small town.
There's not much to the main floor- two bedrooms, a bathroom, a living room, the kitchen, and a utility room in the back.
The basement consists of an entertainment room (tv, recliners, and shelves of books), an extra bedroom, another bathroom, and a place for the washer and dryer.
I've been in that house alone many days and nights and even though there were times when I felt watched or like someone or something was hiding just around the corner, most of the time things were absolutely normal.
One afternoon I was there waiting for a package that I needed to sign for. It was just me and the old family dog that was almost completely blind and close to deaf.
I decided to nap on the couch near the front door so I wouldn't miss the UPS guy knocking.
Just before falling asleep, I heard a loud BAM...BABAM...BABAM coming from the basement. It sounded like someone had put a brick in the dryer and turned it on.
I quickly sat up and noticed that the dog was hearing it as well. He got off the floor, went through the kitchen and stood looking down the stairs.
By the time I got there the noise had stopped so I looked down into the darkness below.
Suddenly I heard a voice from down there. It sounded like a person trying to impersonate a robot.
"Hello" was all it said.
Mom and dad don't have many weapons in the house so I grabbed a broomstick, clicked the light on and descended the stairs.
The dryer was empty and off. I checked the entire basement but nothing was amiss.
As I went back up the stairs I suddenly heard classical music playing from somewhere in the living room.
When I got to the main floor it stopped.
The only thing that would play music in the entire house would be the TV, but it had been off the whole time.
I spent the rest of the afternoon on the couch holding the dog. Eventually the UPS guy came and things went back to normal.
While I've never heard the dryer sound again, I have heard the music a few times, always when I'm downstairs.
No one else has had these experiences.