The craft of a concert technician, calmly & diligently preparing the instrument just minutes before a performance, allowing the the artist to perform as good as they can be, rather than as good as they could of been.
This Italian harpsichord copy by Bruce Kennedy tuned to mean tone
http://www.kennedyharpsichords.com
https://en.m.wikipedia.org/wiki/Meantone_temperament
Bruges early music competition.
http://www.mafestival.be/EN/competitions