用verilog语言实现纯硬件乐曲演奏，并且实现三首不同风格的歌曲的切换，其中包括《与共和国同行》《纸短情长》《国歌》(Using Verilog language to achieve pure hardware music performance, and to achieve three different styles of songs switching, including "Republic of China", "paper short love&q