Ann Wroe said this quote
“ Tuning must come first. Each recital begins with a careful tightening of the pegs on the cross-bar, twisting them in their socket of red threads as each string is plucked and tested. He uses his thumb for this, softer and subtler than the plectrum, his head bent to the vibrating string and his lips slightly open, breathing quickly, as over the body of a lover. ”