I advise you to follow this course to be able to heal yourself/others by being an instrument/becoming healed so you can heal others.
Your voice, vocal toning, Crystal Singing Bowls and other Intruments can be used as medium to bring/keep yourself/others in a balanced state.That can maintained also by using the sound as a sanctuary, by using your voice/vocal toning and humming to keep your immune system in good condition and your intention and focus.