diff --git a/audios/musicplayer.go b/audios/musicplayer.go
index e7db0959..429b19fa 100644
--- a/audios/musicplayer.go
+++ b/audios/musicplayer.go
@@ -23,7 +23,7 @@ const defaultSampleRate beep.SampleRate = 44100
 const quality = 4
 
 func init() {
-	speaker.Init(defaultSampleRate, defaultSampleRate.N(time.Second/30))
+	speaker.Init(defaultSampleRate, defaultSampleRate.N(time.Second/20))
 }
 
 func NewMusicPlayer(f beep.StreamSeekCloser, format beep.Format, ratio float64) MusicPlayer {
@@ -61,6 +61,9 @@ func NewMusicPlayerFromFile(fsys fs.FS, name string, ratio float64) (MusicPlayer
 }
 
 func (mp *MusicPlayer) Play() {
+	if mp.IsEmpty() {
+		return
+	}
 	if mp.played {
 		return
 	}
@@ -78,24 +81,46 @@ func (mp *MusicPlayer) Rewind() {
 
 func (mp MusicPlayer) IsEmpty() bool { return mp.streamer == nil }
 
-func (mp MusicPlayer) IsPlayed() bool { return mp.played }
+func (mp MusicPlayer) IsPlayed() bool {
+	if mp.IsEmpty() {
+		return false
+	}
+	return mp.played
+}
 
 func (mp MusicPlayer) Time() time.Duration {
+	if mp.IsEmpty() {
+		return 0
+	}
 	return defaultSampleRate.D(mp.streamer.Position())
 }
 func (mp MusicPlayer) Duration() time.Duration {
+	if mp.IsEmpty() {
+		return 0
+	}
 	return defaultSampleRate.D(mp.streamer.Len())
 }
 
-func (mp MusicPlayer) PlaybackRate() float64 { return mp.resampler.Ratio() }
+func (mp MusicPlayer) PlaybackRate() float64 {
+	if mp.IsEmpty() {
+		return 1
+	}
+	return mp.resampler.Ratio()
+}
 
 func (mp *MusicPlayer) SetPlaybackRate(ratio float64) {
+	if mp.IsEmpty() {
+		return
+	}
 	speaker.Lock()
 	mp.resampler.SetRatio(ratio)
 	speaker.Unlock()
 }
 
 func (mp *MusicPlayer) SetVolume(vol float64) {
+	if mp.IsEmpty() {
+		return
+	}
 	speaker.Lock()
 	mp.volume.Volume = beepVolume(vol)
 	if vol <= 0.001 { // 0.1%
@@ -106,23 +131,35 @@ func (mp *MusicPlayer) SetVolume(vol float64) {
 	speaker.Unlock()
 }
 
-func (mp MusicPlayer) IsPaused() bool { return mp.ctrl.Paused }
+func (mp MusicPlayer) IsPaused() bool {
+	if mp.IsEmpty() {
+		return false
+	}
+	return mp.ctrl.Paused
+}
 
 func (mp *MusicPlayer) Pause() {
+	if mp.IsEmpty() {
+		return
+	}
 	speaker.Lock()
 	mp.ctrl.Paused = true
 	speaker.Unlock()
 }
 
 func (mp *MusicPlayer) Resume() {
+	if mp.IsEmpty() {
+		return
+	}
 	speaker.Lock()
 	mp.ctrl.Paused = false
 	speaker.Unlock()
 }
 
 func (mp *MusicPlayer) Close() {
-	speaker.Clear()
-	if mp != nil && mp.streamer != nil {
-		mp.streamer.Close()
+	if mp.IsEmpty() {
+		return
 	}
+	speaker.Clear()
+	mp.streamer.Close()
 }
diff --git a/mode/piano/sceneplay.go b/mode/piano/sceneplay.go
index d76fe3d9..96c895ba 100644
--- a/mode/piano/sceneplay.go
+++ b/mode/piano/sceneplay.go
@@ -88,10 +88,7 @@ func NewScenePlay(cfg *Config, assets map[int]*Asset, fsys fs.FS, name string, r
 	}
 
 	const ratio = 1
-	s.musicPlayer, err = audios.NewMusicPlayerFromFile(fsys, s.MusicFilename, ratio)
-	if err != nil {
-		return
-	}
+	s.musicPlayer, _ = audios.NewMusicPlayerFromFile(fsys, s.MusicFilename, ratio)
 	s.SetMusicVolume(*s.MusicVolume)
 
 	s.SoundMap = audios.NewSoundMap(fsys, s.DefaultHitSoundFormat, s.SoundVolume)
@@ -189,6 +186,12 @@ func (s *ScenePlay) Update() any {
 	var worstJudgment mode.Judgment
 	kas := s.readInput()
 	for _, ka := range kas {
+		// Todo: solve this
+		if len(ka.KeyActions) != s.KeyCount {
+			fmt.Println("len(ka.KeyActions) != s.KeyCount")
+			continue
+		}
+
 		missed := s.Scorer.flushStagedNotes(ka.Time)
 		if missed {
 			worstJudgment = s.miss()
@@ -270,11 +273,6 @@ func (s *ScenePlay) tryPlayMusic() {
 
 // Todo: set all sample volumes in advance?
 func (s ScenePlay) playSounds(ka input.KeyboardAction) {
-	if len(ka.KeyActions) != s.KeyCount {
-		fmt.Println("len(ka.KeyActions) != s.KeyCount")
-		return
-	}
-
 	for k, n := range s.stagedNotes {
 		if n == nil {
 			continue
@@ -364,7 +362,7 @@ func (s *ScenePlay) Resume() {
 }
 
 func (s ScenePlay) Finish() any {
-	s.musicPlayer.Close()
+	// s.musicPlayer.Close()
 	if s.Keyboard != nil {
 		s.Keyboard.Close()
 	}
diff --git a/scene/choose/musicplayer.go b/scene/choose/musicplayer.go
index d46b43ce..2bed1472 100644
--- a/scene/choose/musicplayer.go
+++ b/scene/choose/musicplayer.go
@@ -24,13 +24,16 @@ type PreviewMusicPlayer struct {
 
 func (s *Scene) updatePreviewMusic() {
 	// It is fine to call Close at blank MusicPlayer.
-	s.MusicPlayer.Close()
+	if s.MusicPlayer != nil {
+		s.MusicPlayer.Close()
+	}
 
 	c := s.chart()
 	fsys := c.MusicFS
 	name := c.MusicFilename
 	mp, _ := audios.NewMusicPlayerFromFile(fsys, name, 1)
 	mp.SetVolume(s.MusicVolume)
+	// MusicPlayer should be pointer so that it plays only once.
 	s.PreviewMusicPlayer = PreviewMusicPlayer{
 		MusicPlayer: &mp,
 		StartTime:   time.Now(),
diff --git a/scene/config.go b/scene/config.go
index c0756f56..4cdce4ba 100644
--- a/scene/config.go
+++ b/scene/config.go
@@ -52,7 +52,7 @@ func NewConfig() *Config {
 
 		MusicVolume:          0.60,
 		SoundVolume:          0.60,
-		MusicOffset:          0,
+		MusicOffset:          -20,
 		BackgroundBrightness: 0.6,
 		DebugPrint:           true,
 		Replay:               false,