Piano tuning is a difficult job that requires great skills,dedication and the ability to concentrate long and hard. It is doneby independent piano technicians, piano rebuilders, piano storetechnical personnel and hobbyists, but anyone with thedetermination can learn the art and use it to earn money.The job involves adjusting the tensions of the strings toproperly align the intervals between their tones. Every pitch isderived from its relationship to a chosen fixed pitch. Therelationship or interval between two pitches is the ratio of theirabsolute frequencies. Tuning tempers the pitches to attain theperfect ratio by comparing it to a known pitch produced by a tuningfork, which sounds the note of Concert A, long used as a standardtuning note by orchestras. This is the pitch of the violin's