Anything you put online — a tweet, a video, a blog post — is like a message in a bottle. You never know where it will end up and who will find it.

Princess Shaw is the stage name of a New Orleans-based singer known by day as Samantha Montgomery, who cares for the elderly. By night, she writes and sings her own songs on her confessional YouTube channel.

On the other side of the world, Ophir Kutiel is an Israeli artist who creates video mash ups of amateur YouTube performers. He, too, has a stage name — he is known as Kutiman and he is a composer, a musician, and a pioneering video artist. He saw Princess Shaw’s videos and he used one to build a song. A new documentary called “Presenting Princess Shaw” shows how Kutiman developed Princess Shaw’s work to create something magical.

Here is the first Kutiman/ Princess Shaw mash-up and viral sensation “Give it Up.” “Presenting Princess Shaw” is now available on YouTube and Amazon.