M eshulam Greenberger is not your typical publicity-savvy chassidic music professional and chances are you’ve never even heard of him. He doesn’t do weddings or promotional videos will only sing at Torah events and he has no internet access so he can’t even watch himself in clips others have made and posted. But even if the name isn’t familiar certainly his music is. He’s written hundreds of niggunim and who doesn’t know the new “Kad Yasvun ” the fast-beat “Nodeh Lecha ” the Purim classic “Im Al Hamelech Tov ” Avraham Fried’s “Ein Kelokeinu ” and the hartzig ode to King David’s chesed “Dovid Hamelech Alav Hashalom”?