Given that journey, you might be interested in The Law of Attention: Nada Yoga and the Way of Inner Vigilance https://www.amazon.com/dp/1594773041/ https://www.

Given that journey, you might be interested in The Law of Attention: Nada Yoga and the Way of Inner Vigilance https://www.amazon.com/dp/1594773041/ https://www.amazon.com/dp/1594773041/ and Nada Yoga: The Science, Psychology & Philosophy of Anahata Nada Yoga https://www.amazon.com/dp/1890964778/ https://www.amazon.com/dp/1890964778/ .