Simplify the following text for a Grade 7 native English-speaking person.
Original: D major is well-suited to violin music because of the structure of the instrument , which is tuned G D A E. The open strings resonate sympathetically with the D string , producing a sound that is especially brilliant .
Simplified: D major is good for violin music because of the structure of the instrument , which has its four strings tuned to G D A E. The open strings resonate with the D string , producing a special rich sound .