美瞳线晕色都不会掉吗:（在线等）求高手指点一个关于JAVA的问题

代码如下：
//Note.java
package c07.music;

public class Note{
private String noteName;
private Note(String noteName){
this.noteName=noteName;
}
public String toString(){return noteName;}

public static final Note
MIDDLE_C =new Note("Middle_c"),
C_SHARP=new Note("C_Sharp"),
B_FLAT=new Note("B_Flat");
}
//编译成功

//Instrument.java
package c07.music;

public class Instrument {
public void play() {}
public void tune(Instrument i) {
//i.play(Note i);
i.play();
}
}
//编译成功
//Wind.java
package c07.music;

public class Wind extends Instrument{
public void play(Note n){
System.out.println("Wind.play()"+n);
}
}
//编译成功

package c07.music;
//Music.java
public class Music{
public static void tune(Wind i){
i.play(Note.MIDDLE_C);
}
public static void main(String[] args){
Wind flute=new Wind();
tune(flute);
}
}
//编译成功
java Music失败：信息如下
Exception in thread "main" java.lang.NoClassDefFoundError: Music (wrong name: c0
7/music/Music)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)