Here are some of the books, music, and films I have enjoyed. They are presented here in no particular order and I will add more over time.

Books:

Mantra in the Indian Yogic System
The Yoga of Sound, Russill Paul
Wisdom of the Ancient Seers: Mantras of the Rig Veda, Dr. David Frawley
Mantra Yoga and Primal Sound: Secrets of Seed (Bija) Mantras, Dr. David Frawley
Tantra: The Path of Ecstasy, Georg Feuerstein
Awakening Shakti, Sally Kempton
Invoking Lakshmi, Constantina Rhodes
Spanda-karikas The Divine Creative Pulsation, Jaideva Singh

Mysticism and Sound
The Inner Life, Hazrat Inayat Khan
The Mysticism of Sound and Music, Hazrat Inayat Khan
The World is Sound: Nada Brahma, Joachim-Ernst Berendt

Other Global Traditions
The Songlines, Bruce Chatwin

Philosophy
The Spell of the Sensuous, David Abram 

​Mystical Poetry:
Songs of Kabir, translated by Rabindranath Tagore
Speaking of Shiva, translated by A.K. Ramanujan
Mirabai: Ecstatic Poems, Versions by Robert Bly and Jane Hirshfield

CDs: 
Shakti: Tantric Embrace, Russill Paul
Shabda Yoga, Russill Paul

Films:
Ragas Unveiled: India's Voice by Gita and Mukesh Desai