diff -up BlockOutII-2.3/BlockOut_GL/SoundManager.cpp~ BlockOutII-2.3/BlockOut_GL/SoundManager.cpp
--- BlockOutII-2.3/BlockOut_GL/SoundManager.cpp~	2007-11-25 23:13:00.000000000 +0100
+++ BlockOutII-2.3/BlockOut_GL/SoundManager.cpp	2007-11-25 23:13:00.000000000 +0100
@@ -142,7 +142,7 @@ void SoundManager::PlayHit() {
 void SoundManager::PlayMusic() {
 
   if( creditsMusic==NULL ) {
-    creditsMusic = Mix_LoadMUS( LID("sounds/music.mp3") );
+    creditsMusic = Mix_LoadMUS( LID("sounds/music.ogg") );
     if( !creditsMusic ) {
       printf("Music cannot be played: %s\n",SDL_GetError());
       return;