Wish granted: the same electron is added to all atoms in the universe.
This one single electron is created in a quantum state described by a wave function that is uniformly distributed over every atom in the universe. This wave function collapses nearly instantaneously to a single position, and the end result is that one random atom in the entire universe gains one electron.
Nothing of interest happens.













Musescore might be able to do what you need? I believe it has on-screen keyboard as an option for note input, and the last reply in this thread has info for importing PDFs of sheet music.