There was a spot about this on the BBC World Service the other day. Unfortunately, while the piper they featured as their backround music wasn't bad, he wasn't that great, either.

Anyway, I understand the need for people to sleep, but if pipers are playing during daytime and early evening hours, how is that different from the sort of noise that goes on in any busy city street? And given the amount of time that pipers have been busking on the mile, it seems to me that the people who moved in there came to the nuisance, so to speak.

I suppose street pipers could move to something quietier, like fireside or parlour pipes, or even shuttle pipes. But they don't have the same attraction as the GHB.