添加音乐\Data\Bgmusic.mp3
........\....\Crate.bmp
........\.ebug\lesson2.exe
........\.....\lesson2.ilk
........\.....\lesson2.obj
........\.....\lesson2.pch
........\.....\lesson2.pdb
........\.....\vc60.idb
........\.....\vc60.pdb
........\Fmod.dll
........\Fmod.h
........\Fmodvc.lib
........\Lesson2.cpp
........\Lesson2.dsp
........\Lesson2.dsw
........\Lesson2.exe
........\Lesson2.ncb
........\Lesson2.opt
........\lesson2.plg
........\NeHe's Readme.txt
........\Data
........\Debug
添加音乐