diff --git a/async-write.js b/async-write.js
new file mode 100644
index 0000000..a74f236
--- /dev/null
+++ b/async-write.js
@@ -0,0 +1,31 @@
+var taglib = require('./build/Release/taglib');
+var async = require('async');
+var fs = require('fs');
+var match = require('match-files');
+
+var isMp3 = function(path) { return path.match(/\.mp3$/); }
+
+//for (var i = 1; i < 30; i++)
+match.find(process.argv[2], {fileFilters: [isMp3]}, function(err, files) {
+    var t = Date.now();
+    var count = 0;
+    console.log(files.length, "files");
+    async.forEach(files, function(fn, cb) {
+        var tag = taglib.tag(fn, function(err, tag) {
+            if (err)
+                return cb(err);
+            count++;
+            var t = tag.title;
+            var rev = "";
+            for (var i = 0; i < t.length; i++)
+                rev = t[i] + rev;
+            tag.title = rev;
+            tag.save(function(err) {
+                cb(err);
+            });
+        });
+    }, function() {
+        console.log("async", Date.now() - t);
+        console.log("Tag succeeded on", count);
+    });
+});
diff --git a/sync-write.js b/sync-write.js
new file mode 100644
index 0000000..e5edbe9
--- /dev/null
+++ b/sync-write.js
@@ -0,0 +1,26 @@
+var taglib = require('./build/Release/taglib');
+var fs = require('fs');
+var match = require('match-files');
+
+var isMp3 = function(path) { return path.match(/\.mp3$/); }
+
+//for (var i = 0; i < 10; i++)
+match.find(process.argv[2], {fileFilters: [isMp3]}, function(err, files) {
+    var t = Date.now();
+    var count = 0;
+    console.log(files.length, "files");
+    files.forEach(function(fn) {
+        try {
+            var tag = taglib.tagSync(fn);
+            count++;
+            var t = tag.title;
+            var rev = "";
+            for (var i = 0; i < t.length; i++)
+                rev = t[i] + rev;
+            tag.title = rev;
+            tag.saveSync();
+        } catch(e) {}
+    });
+    console.log("sync", Date.now() - t);
+    console.log("Tag succeeded on", count);
+});