diff --git a/stepmania/Themes/default/metrics.ini b/stepmania/Themes/default/metrics.ini
index d827fc6f25..52f8c2f3f1 100644
--- a/stepmania/Themes/default/metrics.ini
+++ b/stepmania/Themes/default/metrics.ini
@@ -2976,7 +2976,7 @@ Line6=conf,RandomBackgrounds
 
 [ScreenAppearanceOptions]
 Fallback=ScreenOptionsSubmenu
-LineNames=1,2,3,4,5,6,7,8,9,10,11,12,13
+LineNames=1,2,3,4,5,6,7,8,9,10,11,12,13,14
 OptionMenuFlags=together;explanations
 Line1=conf,Language
 Line2=conf,Announcer
@@ -2991,6 +2991,7 @@ Line10=conf,CourseSort
 Line11=conf,RandomAtEnd
 Line12=conf,Translations
 Line13=conf,Lyrics
+Line14=conf,AspectRatio
 
 [ScreenOtherOptions]
 Fallback=ScreenOptionsSubmenu
diff --git a/stepmania/src/LuaHelpers.cpp b/stepmania/src/LuaHelpers.cpp
index 6537c197ea..1f154fafaa 100644
--- a/stepmania/src/LuaHelpers.cpp
+++ b/stepmania/src/LuaHelpers.cpp
@@ -153,8 +153,8 @@ void Lua::UpdateGlobals()
 	ASSERT( L );
 
 	/* Important: explicitly refresh cached metrics that we use. */
-	SCREEN_WIDTH.Read();
-	SCREEN_HEIGHT.Read();
+	THEME_SCREEN_WIDTH.Read();
+	THEME_SCREEN_HEIGHT.Read();
 
 	lua_pushnumber( L, SCREEN_WIDTH );
 	lua_setglobal( L, "SCREEN_WIDTH" );
diff --git a/stepmania/src/PrefsManager.cpp b/stepmania/src/PrefsManager.cpp
index 44bb93aa86..c96a3a355d 100644
--- a/stepmania/src/PrefsManager.cpp
+++ b/stepmania/src/PrefsManager.cpp
@@ -75,6 +75,7 @@ PrefsManager::PrefsManager() :
 	m_iMovieColorDepth		( Options, "MovieColorDepth",		16 ),
 	m_iMaxTextureResolution	( Options, "MaxTextureResolution",	2048 ),
 	m_iRefreshRate			( Options, "RefreshRate",			REFRESH_DEFAULT ),
+	m_fAspectRatio			( Options, "AspectRatio",			4/3.0f ),
 	m_bShowStats			( Options, "ShowStats",				
 #ifdef DEBUG
 	true
diff --git a/stepmania/src/PrefsManager.h b/stepmania/src/PrefsManager.h
index ec1ee70690..949a5df46a 100644
--- a/stepmania/src/PrefsManager.h
+++ b/stepmania/src/PrefsManager.h
@@ -26,6 +26,7 @@ public:
 	Preference<int>		m_iMovieColorDepth;
 	Preference<int>		m_iMaxTextureResolution;
 	Preference<int>		m_iRefreshRate;
+	Preference<float>	m_fAspectRatio;
 	Preference<bool>	m_bShowStats;
 	Preference<bool>	m_bShowBanners;
 
diff --git a/stepmania/src/ScreenDimensions.cpp b/stepmania/src/ScreenDimensions.cpp
index c127b698ba..789e3afb05 100644
--- a/stepmania/src/ScreenDimensions.cpp
+++ b/stepmania/src/ScreenDimensions.cpp
@@ -1,8 +1,37 @@
 #include "global.h"
 #include "ScreenDimensions.h"
+#include "PrefsManager.h"
+
+
+ThemeMetric<float> THEME_SCREEN_WIDTH("Common","ScreenWidth");
+ThemeMetric<float> THEME_SCREEN_HEIGHT("Common","ScreenHeight");
+
+//
+// The theme's logical resolution specifies the minimum screen width
+// and the minimum screen height with a 4:3 aspect ratio.  Scale just one 
+// of the dimensions up to meet the requested aspect ratio.
+//
+
+#define ASPECT_4_TO_3 (4/3.0f)
+
+float ScreenWidth()
+{
+	float fScale = 1;
+	if( PREFSMAN->m_fAspectRatio > ASPECT_4_TO_3 )
+		fScale = PREFSMAN->m_fAspectRatio / ASPECT_4_TO_3;
+	ASSERT( fScale >= 1 );
+	return THEME_SCREEN_WIDTH * fScale;
+}
+
+float ScreenHeight()
+{
+	float fScale = 1;
+	if( PREFSMAN->m_fAspectRatio < ASPECT_4_TO_3 )
+		fScale = ASPECT_4_TO_3 / PREFSMAN->m_fAspectRatio;
+	ASSERT( fScale >= 1 );
+	return THEME_SCREEN_HEIGHT * fScale;
+}
 
-ThemeMetric<float> SCREEN_WIDTH("Common","ScreenWidth");
-ThemeMetric<float> SCREEN_HEIGHT("Common","ScreenHeight");
 
 /*
  * (c) 2001-2002 Chris Danford
diff --git a/stepmania/src/ScreenDimensions.h b/stepmania/src/ScreenDimensions.h
index 39c48a41d0..4ce35be350 100644
--- a/stepmania/src/ScreenDimensions.h
+++ b/stepmania/src/ScreenDimensions.h
@@ -6,8 +6,13 @@
 #include "ThemeManager.h"
 #include "ThemeMetric.h"
 
-extern ThemeMetric<float> SCREEN_WIDTH;
-extern ThemeMetric<float> SCREEN_HEIGHT;
+#define SCREEN_WIDTH ScreenWidth()
+#define SCREEN_HEIGHT ScreenHeight()
+float ScreenWidth();
+float ScreenHeight();
+
+extern ThemeMetric<float> THEME_SCREEN_WIDTH;
+extern ThemeMetric<float> THEME_SCREEN_HEIGHT;
 
 #define		SCREEN_LEFT		(0)
 #define		SCREEN_RIGHT	(SCREEN_WIDTH)
diff --git a/stepmania/src/ScreenManager.cpp b/stepmania/src/ScreenManager.cpp
index cd2b686779..8a717c8a78 100644
--- a/stepmania/src/ScreenManager.cpp
+++ b/stepmania/src/ScreenManager.cpp
@@ -95,6 +95,9 @@ void ScreenManager::ThemeChanged()
 	SAFE_DELETE( m_SystemLayer );
 	m_SystemLayer = new ScreenSystemLayer;
 	m_SystemLayer->RefreshCreditsMessages();
+	
+	// reload shared BGA
+	m_pSharedBGA->LoadFromAniDir( m_sLastLoadedBackgroundPath );
 }
 
 void ScreenManager::EmptyDeleteQueue()
@@ -361,9 +364,9 @@ retry:
 	if( sNewBGA.empty() )
 	{
 		m_pSharedBGA->Unload();
-		m_sLastLoadedBackground = "";
+		m_sLastLoadedBackgroundPath = "";
 	}
-	else if( m_sLastLoadedBackground != sNewBGA )
+	else if( m_sLastLoadedBackgroundPath != sNewBGA )
 	{
 		// Create the new background before deleting the previous so that we keep
 		// any common textures loaded.
@@ -372,7 +375,7 @@ retry:
 		SAFE_DELETE( m_pSharedBGA );
 		m_pSharedBGA = pNewBGA;
 
-		m_sLastLoadedBackground = sNewBGA;
+		m_sLastLoadedBackgroundPath = sNewBGA;
 	}
 
 	bool bWasOnSystemMenu = GAMESTATE->m_bIsOnSystemMenu;
diff --git a/stepmania/src/ScreenManager.h b/stepmania/src/ScreenManager.h
index d7000092f3..458e58a429 100644
--- a/stepmania/src/ScreenManager.h
+++ b/stepmania/src/ScreenManager.h
@@ -66,7 +66,7 @@ private:
 	vector<Screen*>		m_ScreenStack;	// bottommost to topmost
 	ScreenSystemLayer	*m_SystemLayer;
 
-	CString				m_sLastLoadedBackground;
+	CString				m_sLastLoadedBackgroundPath;
 	CString				m_sDelayedScreen;
 	ScreenMessage		m_MessageSendOnPop;
 	vector<Screen*>		m_vPreparedScreens;
diff --git a/stepmania/src/ScreenOptionsMaster.cpp b/stepmania/src/ScreenOptionsMaster.cpp
index 0ac15db561..2a2d4afdd1 100644
--- a/stepmania/src/ScreenOptionsMaster.cpp
+++ b/stepmania/src/ScreenOptionsMaster.cpp
@@ -21,6 +21,7 @@
 #include "RageSoundManager.h"
 #include "ProfileManager.h"
 #include "StepsUtil.h"
+#include "LuaHelpers.h"
 
 #define LINE_NAMES				THEME->GetMetric (m_sName,"LineNames")
 #define OPTION_MENU_FLAGS		THEME->GetMetric (m_sName,"OptionMenuFlags")
@@ -535,9 +536,19 @@ void ScreenOptionsMaster::ExportOptions()
 	if( m_sNextScreen == "" )
 		m_sNextScreen = NEXT_SCREEN;
 
-	/* Did the theme change? */
+	if( ChangeMask & OPT_APPLY_ASPECT_RATIO )
+	{
+		Lua::UpdateGlobals();	// This needs to be done before resetting the projection matrix below
+		SCREENMAN->ThemeChanged();	// recreate ScreenSystemLayer and SharedBGA
+	}
+
+	/* If the theme changes, we need to reset RageDisplay to apply new theme 
+	 * window title and icon. */
+	/* If the aspect ratio changes, we need to reset RageDisplay so that the 
+	 * projection matrix is re-created using the new screen dimensions. */
 	if( (ChangeMask & OPT_APPLY_THEME) || 
-		(ChangeMask & OPT_APPLY_GRAPHICS) ) 	// reset graphics to apply new window title and icon
+		(ChangeMask & OPT_APPLY_GRAPHICS) ||
+		(ChangeMask & OPT_APPLY_ASPECT_RATIO) )
 		ApplyGraphicOptions();
 
 	if( ChangeMask & OPT_SAVE_PREFERENCES )
diff --git a/stepmania/src/ScreenOptionsMasterPrefs.cpp b/stepmania/src/ScreenOptionsMasterPrefs.cpp
index b70654df22..255fc646f7 100644
--- a/stepmania/src/ScreenOptionsMasterPrefs.cpp
+++ b/stepmania/src/ScreenOptionsMasterPrefs.cpp
@@ -440,6 +440,12 @@ static void RefreshRate( int &sel, bool ToSel, const ConfOption *pConfOption )
 	MoveMap( sel, PREFSMAN->m_iRefreshRate.Value(), ToSel, mapping, ARRAYSIZE(mapping) );
 }
 
+static void AspectRatio( int &sel, bool ToSel, const ConfOption *pConfOption )
+{
+	const float mapping[] = { 3/4.f,1,4/3.0f,16/10.0f,16/9.f, 8/3.f };
+	MoveMap( sel, PREFSMAN->m_fAspectRatio.Value(), ToSel, mapping, ARRAYSIZE(mapping) );
+}
+
 /* Sound options */
 MOVE( ResamplingQuality,	PREFSMAN->m_iSoundResampleQuality );
 MOVE( AttractSoundFrequency,PREFSMAN->m_iAttractSoundFrequency );
@@ -546,11 +552,13 @@ static void InitializeConfOptions()
 	ADD( ConfOption( "DelayedTextureDelete",	MovePref,			"OFF","ON" ) );
 	g_ConfOptions.back().m_iEffects = OPT_APPLY_GRAPHICS;
 	ADD( ConfOption( "CelShade\nModels",		CelShadeModels,		"OFF","ON" ) );
-	ADD( ConfOption( "SmoothLines",				SmoothLines,		"OFF","ON" ) );
+	ADD( ConfOption( "Smooth\nLines",			SmoothLines,		"OFF","ON" ) );
 	g_ConfOptions.back().m_iEffects = OPT_APPLY_GRAPHICS;
 	ADD( ConfOption( "Refresh\nRate",			RefreshRate,		"DEFAULT","60","70","72","75","80","85","90","100","120","150" ) );
 	g_ConfOptions.back().m_iEffects = OPT_APPLY_GRAPHICS;
-	ADD( ConfOption( "Vsync",					MovePref,		"NO", "YES" ) );
+	ADD( ConfOption( "Aspect\nRatio",			AspectRatio,		"3:4","1:1","4:3","16:10","16:9","8:3" ) );
+	g_ConfOptions.back().m_iEffects = OPT_APPLY_ASPECT_RATIO;
+	ADD( ConfOption( "Vsync",					MovePref,			"NO", "YES" ) );
 	g_ConfOptions.back().m_iEffects = OPT_APPLY_GRAPHICS;
 	ADD( ConfOption( "ShowStats",				MovePref,			"OFF","ON" ) );
 	ADD( ConfOption( "ShowBanners",				MovePref,			"OFF","ON" ) );
diff --git a/stepmania/src/ScreenOptionsMasterPrefs.h b/stepmania/src/ScreenOptionsMasterPrefs.h
index 4a84d802c8..a7cec78294 100644
--- a/stepmania/src/ScreenOptionsMasterPrefs.h
+++ b/stepmania/src/ScreenOptionsMasterPrefs.h
@@ -8,6 +8,7 @@ static const int MAX_OPTIONS=16;
 #define OPT_RESET_GAME					(1<<3)
 #define OPT_APPLY_SOUND					(1<<4)
 #define OPT_APPLY_SONG					(1<<5)
+#define OPT_APPLY_ASPECT_RATIO			(1<<6)
 
 struct ConfOption
 {