Gravity's law on your side https://youtu.be/28zKrRFFPc4?t=14s
Old-fashioned vs Modern guitars http://www.rdiaz.org/rd-art%207.html
Three-dimensional sound https://youtu.be/yp15_iiIK5U?t=14s
Conditioned by habit http://youtu.be/q_MkQjgbjUM?t=14s
Luthiers Can't Define Play-ability http://youtu.be/z3Ps3U1jT5I?t=14s
^Ex.1/ 00:19 Paco 1
Ex.2/ 03:28 Paco 2
Ex.3/ 03:17 Niño Ricardo
Ex.4/ 00:24 topic
