As we all know, wood is the material that is transmitting the vibration that makes the sound. The density and makeup of their cell structure in conjunction the other factors is what determine its tonality. Do you know how ukulele tone depends on the wood? which wood makes the best ukulele?
Do you know the timbre characteristics of various ukulele woods? Even studying sound waves won’t factor things like individual playing styles, or even distinctions in the same species of wood. Of course, a sound being good or bad is ultimately decided by the listener, and their bias/illusion could also be noted.