diff --git a/stdlib/sound.sun b/stdlib/sound.sun
index c03c92b..75dfa2b 100644
--- a/stdlib/sound.sun
+++ b/stdlib/sound.sun
@@ -9,3 +9,7 @@ builtin startBGM(num);
 builtin stopBGM(num);
 
 builtin startSE(num);
+builtin startEventSE(num);
+
+builtin startMontemanBGM();
+builtin startMontemanFanfare();