<https://ericjohnsonpianos.com/what-is-piano-tuning/>
<http://schema.org/description>
"The question \"what is piano tuning\" has a simple answer and a complicated answer. The simple answer is that piano tuning is the process of adjusting the tension on strings to achieve desired pitch. The complicated answer includes harmonics, numbers and a lot of judgement."
<https://ericjohnsonpianos.com/what-is-piano-tuning/>