Why do people Om?
Om is the sound of the universe. When the instructor invites the class to chant om, it is for the purpose of uniting the energy in the room and connecting everyone that is in class. Chanting is not singing. When om is chanted, it is a vibration that is made audible so it doesn’t matter if you can carry a tune or not, you’re always invited to chant. And it is always okay not to chant.