设计一个基于MCS-51系列单片机的音乐盒，利用试验板上的开关，按开关切换演奏出不同的乐曲。蜂鸣器发出某个音调，与之相对应的LED亮起。使用两个按键，一个用来切换歌曲，另一个切换八路LED的变化花样-Design an MCS-51 series microcontroller-based Music Box, a test panel of the switch, switch to play different music. The buzzer sounded a tone, the corresponding LED lights up. Use two buttons, one to switch songs, and another to switch the pattern of eight LED' s change