Check out these old demos from really famous stars!

Thanks to the miracle of modern technology, demos from our favorites have popped up online! Want to see a VERY young Justin Bieber? Check this out!

Madonna fans! Here's an old demo from the Material Girl:

You know Adele's been making demos since she was a teenager! Here's one of her old videos:

If you saw Montage Of Heck: The Home Recordings- this may sound familiar to you!

You can read more here and see even more demos too!