Here the carnal man goes silent. Babylon is that whole materialistic, emotional self a person has built, and its music is the pleasant noise the senses keep playing so the flesh never has to sit still: strings and pipes and trumpets that keep attention busy on the outside. When the inner fire rises and burns that state away, the entertainment stops, the trades that served appetite close down, and the grinding wheel of the pineal stone falls quiet in the place of emotions where it had been turning.
That quiet is not loss but clearing. The carnal self runs on constant stimulation, and when it is overthrown the sounds it lived by simply cease, because there is no longer a lower nature left to amuse.
Babylon: the carnal, materialistic emotional self a person builds over a lifetime
Harpers and pipers and trumpeters: the pleasant distractions of the senses that keep attention fixed outward
Craftsman: the appetite's trades and busywork that serve the flesh
Millstone: the pineal stone, turning in the place of emotions until the inner fire stills it