diff --git a/pylast/__init__.py b/pylast/__init__.py
index fd5c94e..437b817 100644
--- a/pylast/__init__.py
+++ b/pylast/__init__.py
@@ -1245,7 +1245,7 @@ class _BaseObject(object):
 
         return hash(self.network) + hash(six.text_type(type(self)) + "".join(
             list(self._get_params().keys()) + list(values)
-        ).lower())
+        ).casefold())
 
     def _extract_cdata_from_request(self, method_name, tag_name, params):
         doc = self._request(method_name, True, params)
@@ -1444,7 +1444,7 @@ class _Chartable(object):
             self.ws_prefix + method, True, params)
 
         seq = []
-        for node in doc.getElementsByTagName(chart_kind.lower()):
+        for node in doc.getElementsByTagName(chart_kind.casefold()):
             item = chart_type(
                 _extract(node, "artist"), _extract(node, "name"), self.network)
             weight = _number(_extract(node, "playcount"))
@@ -1534,11 +1534,11 @@ class _Taggable(object):
         tags_on_server = self.get_tags()
 
         for tag in tags_on_server:
-            c_old_tags.append(tag.get_name().lower())
+            c_old_tags.append(tag.get_name().casefold())
             old_tags.append(tag.get_name())
 
         for tag in tags:
-            c_new_tags.append(tag.lower())
+            c_new_tags.append(tag.casefold())
             new_tags.append(tag)
 
         for i in range(0, len(old_tags)):
@@ -1669,10 +1669,10 @@ class _Opus(_BaseObject, _Taggable):
     def __eq__(self, other):
         if type(self) != type(other):
             return False
-        a = self.get_title().lower()
-        b = other.get_title().lower()
-        c = self.get_artist().get_name().lower()
-        d = other.get_artist().get_name().lower()
+        a = self.get_title().casefold()
+        b = other.get_title().casefold()
+        c = self.get_artist().get_name().casefold()
+        d = other.get_artist().get_name().casefold()
         return (a == b) and (c == d)
 
     def __ne__(self, other):
@@ -1847,7 +1847,7 @@ class Artist(_BaseObject, _Taggable):
 
     def __eq__(self, other):
         if type(self) is type(other):
-            return self.get_name().lower() == other.get_name().lower()
+            return self.get_name().casefold() == other.get_name().casefold()
         else:
             return False
 
@@ -2237,7 +2237,7 @@ class Country(_BaseObject):
         return self.get_name()
 
     def __eq__(self, other):
-        return self.get_name().lower() == other.get_name().lower()
+        return self.get_name().casefold() == other.get_name().casefold()
 
     def __ne__(self, other):
         return self.get_name() != other.get_name()
@@ -2321,12 +2321,12 @@ class Metro(_BaseObject):
         return self.get_name() + ", " + self.get_country()
 
     def __eq__(self, other):
-        return (self.get_name().lower() == other.get_name().lower() and
-                self.get_country().lower() == other.get_country().lower())
+        return (self.get_name().casefold() == other.get_name().casefold() and
+                self.get_country().casefold() == other.get_country().casefold())
 
     def __ne__(self, other):
         return (self.get_name() != other.get_name() or
-                self.get_country().lower() != other.get_country().lower())
+                self.get_country().casefold() != other.get_country().casefold())
 
     def _get_params(self):
         return {'metro': self.get_name(), 'country': self.get_country()}
@@ -2802,10 +2802,10 @@ class Tag(_BaseObject, _Chartable):
         return self.get_name()
 
     def __eq__(self, other):
-        return self.get_name().lower() == other.get_name().lower()
+        return self.get_name().casefold() == other.get_name().casefold()
 
     def __ne__(self, other):
-        return self.get_name().lower() != other.get_name().lower()
+        return self.get_name().casefold() != other.get_name().casefold()
 
     def _get_params(self):
         return {self.ws_prefix: self.get_name()}
@@ -3026,7 +3026,7 @@ class Group(_BaseObject, _Chartable):
         return self.get_name()
 
     def __eq__(self, other):
-        return self.get_name().lower() == other.get_name().lower()
+        return self.get_name().casefold() == other.get_name().casefold()
 
     def __ne__(self, other):
         return self.get_name() != other.get_name()
@@ -4123,7 +4123,7 @@ def _extract_events_from_doc(doc, network):
 def _url_safe(text):
     """Does all kinds of tricks on a text to make it safe to use in a url."""
 
-    return url_quote_plus(url_quote_plus(_string(text))).lower()
+    return url_quote_plus(url_quote_plus(_string(text))).casefold()
 
 
 def _number(string):