The first three notes fill whatever room they're played in, and then the room is no longer the same room. Organ music doesn't ask you to listen, it relocates you. The body knows before the mind does: stone, height, the physics of air pushed through pipes built centuries before you were born. The Toccata in D minor is the door; what's on the other side is Bach's understanding that sound is architecture. Air on the G String is the gentler proof, a single line that moves like breath held and slowly released. The Brandenburg No. 3 is joy, the kind that requires no justification and no apology.