Well, a better question would be to ask why your landlord have to pay for something that is neither their fault, nor something they can do anything about?
Certainly, from my own experience this is an irksome problem. In order to fix it, the tenant above's landlord (or them if they are the owners) would have to fix the problem.
Have you spoken to the tenants above? If it's really that bad you could try and get environmental health round to do a noise check, however unless the noise level is above a certain amount of decibels there's very little they can do.