Girls slumber party... hmmm... oops! forgive the intrusion ladies... the instrument of which you speak is the concertina, invented about 1830. Might I suggest a hurdy-gurdy instead. And no, that's not the thing that the guy with the monkey is playing.
Again, my apologies for the intrusion, you can all go back to slumbering now.
Blackjohn
You may suggest away. It seems that I am a century off. And don't run off so quickly, John.