1 Peter 2:21-25
Piano tuning is an art in which minute adjustments are made to the tension of the strings of an acoustic piano in order to assure that the interval between their tones is “in tune.” This requires an assessment of the interaction of vibration between the notes. In order to accomplish this, piano tuners use a “tuning fork” to get a fixed pitch. Usually this is A440, the note A above middle C (261.626 Hz). In his book The Pursuit of God, A.W. Tozer wrote: “Has it ever occurred to you that one hundred pianos all tuned to the same fork are automatically tuned to each other? They are of one accord by being tuned, not to each other, but to another standard to which each one must individually bow. So one hundred worshipers [meeting] together, each one looking away to Christ, are in heart nearer to each other than they could possibly be, were they to become ‘unity’ conscious and turn their eyes away from God to strive for closer fellowship.” (The Pursuit of God, p. 90) We daily endeavor to be conformed to the image of our Lord and Savior. As we follow in His footsteps we find that we are one with our brothers and sisters in Christ who also are doing their best to please the Lord in their thoughts, words and deeds.
https://en.wikipedia.org/wiki/Piano_tuning
By Dr. Gayle Woods