diff --git a/miyu_bot/commands/cogs/event.py b/miyu_bot/commands/cogs/event.py
index 1f2438e..b7b00bd 100644
--- a/miyu_bot/commands/cogs/event.py
+++ b/miyu_bot/commands/cogs/event.py
@@ -29,7 +29,7 @@ class Event(commands.Cog):
                       aliases=['ev'],
                       description='Finds the event with the given name.',
                       help='!event pkcooking')
-    async def event(self, ctx: commands.Context, *, arg: str = ""):
+    async def event(self, ctx: commands.Context, *, arg: commands.clean_content = ""):
         self.logger.info(f'Searching for event "{arg}".')
 
         event: EventMaster
diff --git a/miyu_bot/commands/cogs/music.py b/miyu_bot/commands/cogs/music.py
index d347572..426abad 100644
--- a/miyu_bot/commands/cogs/music.py
+++ b/miyu_bot/commands/cogs/music.py
@@ -48,7 +48,7 @@ class Music(commands.Cog):
                       aliases=['music'],
                       description='Finds the song with the given name.',
                       help='!song grgr')
-    async def song(self, ctx: commands.Context, *, arg: str):
+    async def song(self, ctx: commands.Context, *, arg: commands.clean_content):
         self.logger.info(f'Searching for song "{arg}".')
 
         song = masters.music.get(arg, ctx)
@@ -100,7 +100,7 @@ class Music(commands.Cog):
                       aliases=[],
                       description='Finds the chart with the given name.',
                       help='!chart grgr\n!chart grgr normal')
-    async def chart(self, ctx: commands.Context, *, arg: str):
+    async def chart(self, ctx: commands.Context, *, arg: commands.clean_content):
         self.logger.info(f'Searching for chart "{arg}".')
 
         name, difficulty = self.parse_chart_args(arg)
@@ -123,7 +123,7 @@ class Music(commands.Cog):
                       aliases=['mixes'],
                       description='Finds the sections of the chart with the given name.',
                       help='!sections grgr')
-    async def sections(self, ctx: commands.Context, *, arg: str):
+    async def sections(self, ctx: commands.Context, *, arg: commands.clean_content):
         self.logger.info(f'Searching for chart sections "{arg}".')
 
         name, difficulty = self.parse_chart_args(arg)
@@ -151,7 +151,7 @@ class Music(commands.Cog):
                       aliases=['songsearch', 'song_search'],
                       description='Finds songs matching the given name.',
                       help='!songs grgr')
-    async def songs(self, ctx: commands.Context, *, arg: str = ''):
+    async def songs(self, ctx: commands.Context, *, arg: commands.clean_content = ''):
         self.logger.info(f'Searching for songs "{arg}".' if arg else 'Listing songs.')
         arguments = parse_arguments(arg)
         songs = masters.music.get_sorted(arguments.text_argument, ctx)
@@ -287,7 +287,7 @@ class Music(commands.Cog):
 
         return embeds, files
 
-    def parse_chart_args(self, arg: str) -> Tuple[str, ChartDifficulty]:
+    def parse_chart_args(self, arg: commands.clean_content) -> Tuple[str, ChartDifficulty]:
         split_args = arg.split()
 
         difficulty = ChartDifficulty.Expert
diff --git a/miyu_bot/commands/cogs/utility.py b/miyu_bot/commands/cogs/utility.py
index 39decfa..d2e6a4f 100644
--- a/miyu_bot/commands/cogs/utility.py
+++ b/miyu_bot/commands/cogs/utility.py
@@ -11,10 +11,12 @@ class Utility(commands.Cog):
         self.logger = logging.getLogger(__name__)
 
     @commands.command(hidden=True)
+    @commands.is_owner()
     async def romanize(self, ctx: commands.Context, *, arg: str):
         await ctx.send(romanize(arg))
 
     @commands.command(hidden=True, ignore_extra=False)
+    @commands.is_owner()
     async def similarity_score(self, ctx: commands.Context, source: str, target: str):
         await ctx.send(str(FuzzyMatcher().score(romanize(source), romanize(target))))