hmmm, was just wondering why they are 4 strings in violin, 6 strings in guitar, and stuffs like that. If I were to make a wild guess, violin and other classical instruments have 4 strings, because we have 4 fingers, one finger will cover one string. Guitars have 6 strings to sound good in chords? One of the most famous chinese instrument, the Er-Hu, have only two strings, and the bow is actually in between the two strings, so you can't separate the bow from the instrument, have totally no idea where's the origin of those. http://chcp.org/music/erhu.html Anyone can give me some history lessons?