diff --git a/CREDITS b/CREDITS
index 8de9ed58..0e9a91f7 100644
--- a/CREDITS
+++ b/CREDITS
@@ -967,4 +967,4 @@ D: Freedoom website
 
 S: rostuhan
 E: rostuhan123@gmail.com
-D: D_DM07 music
+D: D_DM07 and D_DM13 music
diff --git a/musics/d_dm13.mid b/musics/d_dm13.mid
index 616af838..de73f072 100644
Binary files a/musics/d_dm13.mid and b/musics/d_dm13.mid differ