Nada Yoga - Union through sounds
Nada yoga is a branch of yoga that brought transformation through the shabd or nada. The closest translation for shabd or nada is sound/vibration.
They can be produced either by striking two objects known as Ahata wound or without striking two objects which can be heard at Anahata or heart chakra. We can not see energy, but we can feel it as vibration. All energy, all vibration generate sound.
Peace, love and light