Everything is energy.
528hz represents the mi frequency of the Solfeggio Scale, an ancient scale that matches the key vibrational frequencies of your body.
The main six Solfeggio frequencies are:
Do 396 Hz -- Removing Guilt and Fear
Re 417 Hz -- Change
Mi 528 Hz -- DNA Repair
Far 639 Hz -- Connections
So 741 Hz -- Awakening Intuition
La 852 Hz -- Spiritual Order
Modern music is intentionally tuned differently to ensure it does not provide the connection between music and your inner vibration.
Enjoy and share.