What is the general cost of piano tuning?
The going price here in the Bangor area of Maine is about $100. The time it takes is at least 2 hours which includes minor adjustments, simple cleaning, and lubrication. There are added charges if there is a repair such as a broken string, replacement of saddle straps, or trimming of dampers that may be buzzing. One of the best piano reference resources is http://www.steinway.com/technical/tuning.
