Buskers playing loud songs over and over have been compared to psychological torture by a judge who has ordered Westminster Council to stop the racket.
Global Radio took the authority to court over the noise which it said forced some staff to work in cupboards.
The judge said they were being subjected to "industrially amplified daily concerts" outside their windows.
He added: "While the volume is the principal mischief it is clear that the nuisance is exacerbated by the repetition and poor quality of some of the performances".