diff --git a/music_kraken/utils/string_processing.py b/music_kraken/utils/string_processing.py
index b591604..00b6024 100644
--- a/music_kraken/utils/string_processing.py
+++ b/music_kraken/utils/string_processing.py
@@ -56,6 +56,7 @@ def fit_to_file_system(string: Union[str, Path]) -> Union[str, Path]:
         return fit_string(string)
 
 
+@lru_cache(maxsize=128)
 def clean_song_title(raw_song_title: str, artist_name: Optional[str] = None) -> str:
     """
     This function cleans common naming "conventions" for non clean song titles, like the title of youtube videos
@@ -76,6 +77,9 @@ def clean_song_title(raw_song_title: str, artist_name: Optional[str] = None) ->
 
     # remove brackets and their content if they contain disallowed substrings
     for open_bracket, close_bracket in zip(OPEN_BRACKETS, CLOSE_BRACKETS):
+        if open_bracket not in raw_song_title or close_bracket not in raw_song_title:
+            continue
+        
         start = 0
 
         while True: