Playing its notes

I woke up really dizzy.
''Ohhh not again!''
I dreamt of a nightmare
and got a scare.
Got out of bed
and heard a sound.
I silently crept outside at 5:00am.
and there it was.
Brown, smooth and a medium sized object.
Playing its notes.
Sounded like someone flicking a ruler
but in a very nice way.
Sat there gracefully,
repeating the lovely music.
It played its strings
and then it stopped.
It looked like a body
except it had a long neck.