diff --git a/badger-am.js b/badger-am.js
index d7cd7a7..123797e 100755
--- a/badger-am.js
+++ b/badger-am.js
@@ -5,7 +5,6 @@ const os = require('os');
 const path = require('path');
 const async = require('async');
 const commander = require('commander');
-const recursive = require('recursive-readdir');
 const app = require('./package.json');
 const audio = require('./lib/audio');
 const util = require('./lib/util');
@@ -51,82 +50,39 @@ function run() {
     commander.parse(process.argv);
 }
 
-// create config object
-function getConfig(input, output, options, commander) {
-    return {
+// convert files
+function convert(input, output, options) {
+    audio.batchConvert({
         input: path.normalize(input),
         output: path.normalize(output),
         concurrency: commander.concurrency || os.cpus().length,
         bitrate: options.bitrate || 320,
         format: options.format || '.flac'
-    }
-}
-
-// convert files
-function convert(input, output, options) {
-    audio.batchConvert(getConfig(input, output, options, commander), function (err) {
+    }, function (err) {
         cli.exit(err);
     });
 }
 
 // sort files
 function sort(input, output, options) {
-    util.batchSort(getConfig(input, output, options, commander), function (err) {
+    util.batchSort({
+        input: path.normalize(input),
+        output: path.normalize(output),
+        concurrency: commander.concurrency || os.cpus().length,
+        bitrate: options.bitrate || 320,
+        format: options.format || '.flac'
+    }, function (err) {
         cli.exit(err);
-    })
-}
-
-// move file to location defined by its metadata
-function processFileSort(output, sourceFile, callback) {
-    async.waterfall([
-        function (asyncCallback) {
-            audio.extractMetadata(sourceFile, asyncCallback)
-        },
-        function (sourceFile, metadata, asyncCallback) {
-            util.pathFromMetadata(sourceFile, output, metadata, asyncCallback);
-        },
-        function (targetFile, asyncCallback) {
-            util.moveFile(sourceFile, targetFile, asyncCallback);
-        }
-    ], function (err, results) {
-        if (err) {
-            return callback(err);
-        }
-        callback(null, results);
     });
 }
 
 // extract artwork
 function artwork(input, options) {
-    async.waterfall([
-        function (asyncCallback) {
-            recursive(input, [ignoreFilter], asyncCallback);
-        },
-        function (files, asyncCallback) {
-            console.log(files.length + ' \'' + options.format + '\' files found');
-            // display progressbar
-            const bar = util.createProgressBar(files.length);
-            // handle each file
-            async.eachLimit(files, commander.concurrency, function (file, eachCallback) {
-                audio.extractArtwork(file, function (err) {
-                    bar.tick();
-                    if (err) {
-                        return eachCallback(err);
-                    }
-                    eachCallback();
-                });
-            }, function (err) {
-                if (err) {
-                    return asyncCallback(err);
-                }
-                asyncCallback();
-            });
-        }
-    ], function (err, result) {
-        util.exit(err, start);
+    audio.batchArtwork({
+        input: path.normalize(input),
+        concurrency: commander.concurrency || os.cpus().length,
+        format: options.format || '.flac'
+    }, function (err) {
+        cli.exit(err);
     });
-
-    function ignoreFilter(file, stats) {
-        return !stats.isDirectory() && path.extname(file).indexOf(options.format) == -1;
-    }
 }
\ No newline at end of file
diff --git a/lib/audio.js b/lib/audio.js
index 9ee125f..da82255 100644
--- a/lib/audio.js
+++ b/lib/audio.js
@@ -73,27 +73,57 @@ function convert(source, config, callback) {
     ], callback);
 }
 
-// extract cover artwork
-function extractArtwork(sourceFile, callback) {
+//
+function batchArtwork(config, callback) {
     async.waterfall([
-        function (asyncCallback) {
-            extractMetadata(sourceFile, asyncCallback);
+        // get files
+        function (waterfallCallback) {
+            util.readDirRecursive(config.input, config.format, waterfallCallback);
         },
-        function (metadata, asyncCallback) {
-            metadata.picture.forEach(function (picture) {
-                const pic = path.join(path.dirname(sourceFile), path.basename(sourceFile, path.extname(sourceFile)) + '.' + picture.format);
-                const stream = fs.createWriteStream(pic);
-                stream.write(picture.data);
-                stream.end();
-                asyncCallback();
+        // display info, prompt user and create progressbar
+        function (files, waterfallCallback) {
+            cli.askForConfirmation(files.length + ' files found.\nstart artwork extraction now?', ['yes', 'y'], function (err) {
+                if (err) {
+                    return waterfallCallback(err);
+                }
+                waterfallCallback(null, files, cli.createProgressBar(files.length));
             });
+        },
+        // process each file
+        function (files, bar, waterfallCallback) {
+            async.eachLimit(files, config.concurrency, function (file, eachCallback) {
+                extractArtwork(file, function (err) {
+                    bar.tick();
+                    if (err) {
+                        return eachCallback(err);
+                    }
+                    eachCallback();
+                });
+            }, waterfallCallback);
         }
-    ], function (err, result) {
-        if (err) {
-            return callback(err);
+    ], callback);
+}
+
+// extract cover artwork
+function extractArtwork(source, callback) {
+    async.waterfall([
+        // get metadata
+        function (waterfallCallback) {
+            extractMetadata(source, waterfallCallback);
+        },
+        // write image to disk
+        function (metadata, waterfallCallback) {
+            if (!metadata.picture) {
+                waterfallCallback();
+            }
+            for (let counter = 0, length = metadata.picture.length; counter < length; counter++) {
+                const stream = fs.createWriteStream(path.join(path.dirname(source), path.basename(source, path.extname(source)) + '.' + metadata.picture[counter].format));
+                stream.write(metadata.picture[counter].data);
+                stream.end();
+            }
+            waterfallCallback();
         }
-        callback();
-    });
+    ], callback);
 }
 
 // extract metadata for further processing
@@ -109,7 +139,8 @@ function extractMetadata(sourceFile, callback) {
 }
 
 // api
-exports.convert = convert;
 exports.batchConvert = batchConvert;
+exports.convert = convert;
+exports.batchArtwork = batchArtwork;
 exports.extractArtwork = extractArtwork;
 exports.extractMetadata = extractMetadata;
\ No newline at end of file
diff --git a/package.json b/package.json
index 954129d..218c8af 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "badger-am",
-  "version": "0.5.1",
+  "version": "0.5.2",
   "license": "MIT",
   "description": "audio manager",
   "author": "Daniel Sommer <daniel.sommer@velvettear.de>",