Power of Music

I'd just arrived at work and was doing a circuit of the house when I passed one of the bedrooms. One of our guests was playing a CD and I'd heard just a couple of bars, recognized and reacted instantly to it. Bang!! Throat closed, tears welling. Bob Marley's 'Redemption Song' from 'Uprising'. Emphatically played solo guitar; Bob's incredible voice; powerful lyrics. How is it that a sound can do that??

"Emancipate yourselves from mental slavery
None but ourselves can free our minds."