diff --git a/SDLWrapper/Music.cpp b/SDLWrapper/Music.cpp
index 4e508a9..9bdae9b 100644
--- a/SDLWrapper/Music.cpp
+++ b/SDLWrapper/Music.cpp
@@ -1,20 +1,36 @@
 #include "Music.h"
 #include "begin_code.h"
-void Music::_set(Mix_Music* p)//private
+//private
+void Music::_set(Mix_Music* p)
 {
     _music.reset(p,Mix_FreeMusic);
 }
-
-void Music::_clear()//private
+//private
+void Music::_clear()
 {
     _music.reset();
 }
-
-Mix_Music* Music::_get()//private
+//private
+Mix_Music* Music::_get() const
 {
     return _music.get();
 }
 
+Music::Music(const std::string& Filename)
+{
+    _set(Mix_LoadMUS(Filename.c_str()));
+}
+
+bool Music::isReady() const
+{
+    return (_get()!=nullptr);
+}
+
+void Music::release()
+{
+    _clear();
+}
+
 //static
 int MusicPlayer::GetDecoderNum()
 {
@@ -27,20 +43,6 @@ std::string MusicPlayer::GetDecoderName(int index)
     return std::string(Mix_GetMusicDecoder(index));
 }
 
-Music MusicPlayer::loadMusic(const std::string& Filename) throw(ErrorViewer)
-{
-    Mix_Music* temp = Mix_LoadMUS(Filename.c_str());
-    if (temp == nullptr)
-    {
-        ErrorViewer e;
-        e.fetch();
-        throw e;
-    }
-    Music m;
-    m._set(temp);
-    return m;
-}
-
 int MusicPlayer::play(Music music, int loops)
 {
     m = music;
@@ -77,17 +79,17 @@ int MusicPlayer::fadeOut(int ms)
     return Mix_FadeOutMusic(ms);
 }
 
-bool MusicPlayer::isPlaying()
+bool MusicPlayer::isPlaying() const
 {
     return (Mix_PlayingMusic() == 1);
 }
 
-bool MusicPlayer::isPaused()
+bool MusicPlayer::isPaused() const
 {
     return (Mix_PausedMusic() == 1);
 }
 
-int MusicPlayer::isFading()
+int MusicPlayer::isFading() const
 {
     switch (Mix_FadingMusic())
     {
@@ -102,10 +104,9 @@ int MusicPlayer::isFading()
     }
 }
 
-//static
-int MusicPlayer::SetMusicPosition(double position)
+int MusicPlayer::setPosition(double second)
 {
-    return Mix_SetMusicPosition(position);
+    return Mix_SetMusicPosition(second);
 }
 
 #include "end_code.h"
diff --git a/SDLWrapper/Music.h b/SDLWrapper/Music.h
index d7a3b51..7966886 100644
--- a/SDLWrapper/Music.h
+++ b/SDLWrapper/Music.h
@@ -4,45 +4,43 @@
 #include <string>
 #include "ErrorViewer.h"
 #include "Audio.h"
+#include "__Noncopyable.h"
 #include "begin_code.h"
 /// Forward Declaration
 class Music
 {
 public:
-
-protected:
-    Music() = default;
+    Music()=default;
+    Music(const std::string& Filename);
+    bool isReady() const;
+    void release();
 private:
     std::shared_ptr<Mix_Music> _music;
     void _set(Mix_Music*);
     void _clear();
-    Mix_Music* _get();
+    Mix_Music* _get() const;
     friend class MusicPlayer;
 };
 
-class MusicPlayer : public AudioPlayer
+class MusicPlayer : public AudioPlayer, public NonCopyable
 {
 public:
     static int GetDecoderNum();
     static std::string GetDecoderName(int index);
 
-    Music loadMusic(const std::string& Filename) throw (ErrorViewer);
-
+    /// Play Music. Loop: -1:Infinite, >0:Exact that time.
     int play(Music music, int loops);
     void pause();
     void resume();
     void rewind();
+    int setPosition(double second);
     int stop();
     int fadeIn(int loops, int ms);
     int fadeOut(int ms);
 
-    bool isPlaying();
-    bool isPaused();
-    int isFading();
-
-    /// Experimental
-    static int SetMusicPosition(double position);
-
+    bool isPlaying() const;
+    bool isPaused() const;
+    int isFading() const;
 private:
     Music m;
 };
diff --git a/SDLWrapper/__Noncopyable.h b/SDLWrapper/__Noncopyable.h
index 22dd719..c2c820c 100644
--- a/SDLWrapper/__Noncopyable.h
+++ b/SDLWrapper/__Noncopyable.h
@@ -1,4 +1,5 @@
 #pragma once
+#include "begin_code.h"
 class NonCopyable
 {
 protected:
@@ -7,3 +8,4 @@ protected:
     NonCopyable(const NonCopyable&) = delete;
     NonCopyable& operator = (const NonCopyable&) = delete;
 };
+#include "end_code.h"