I have known about the use of sounds in Yoga by way of mantra for years. But, I have also come across the use of either sounding out vowels to stimulate the chakras , energy vortexes for alignment and healing. Listening to sounds can be stimulating or calming. Think of the Rocky theme song as an example to motivate. Yet, the gentle sounds of flowing water are calming. Another method of using sounds is the use of singing bowls metal and crystal. Metal are more traditional and crystal are more contemporary. The sounds from crystal singing bowls can be very powerful. If you are interested suss it out for yourself.