Abstract
The discussion of the timbre of a musical instrument is still experiential and subjective. Concerning the issue such as "what it is the beautiful tone", many scientists have analyzed violins of Stradivari's work from the various point of view in order to explain what the beauty of a tone is, and they will still have tried so far.
As for an important literature about violin research, the papers by Hutchins are famous, but in addition, I introduce many researches in the present paper for “visualization of music and musical instrument" special edition, especially about the violin. The researches on visualization of a timbre in recent years are surveyed across boundaries such as the acoustic, structure, material, and education.
