Here is how to play the famous song Happy Birthday on a harmonica. This is a very basic score, you don't need tabs. This is an excellent training to learn to read music and play along with your own harmonica. It can be played on a diatonic harmonica in C as well as a chromatic harmonica of course since we chromatic harmonica players can play in any key without much trouble at all! :-)

Here's the version with the sheet music score:

And without:

Enjoy and play this song at any chance you get for birthday of all people you know, play it loud and annoy them good! :-)