first, I'm sorry that not be good at English. I don't know motion of a string from a classical point of view. Generally it deals with quantum mechanics. But I want to know motion of a string from a classical point of view. In the case of a very simple open string(spin with c velocity), one mode string, two modes string,...and a simple close string, one mode string, two modes string....etc. I know that it's complicate. I just hope obtain some ideas or information(website, books, treatise... everything). Then I can calculate that with computer.