Add song/genre sync

app/src/main/java/com/cappielloantonio/play/interfaces/MediaCallback.java

@@ -1,10 +1,9 @@
 package com.cappielloantonio.play.interfaces;
 
-import com.android.volley.VolleyError;
-
 import java.util.List;
 
 public interface MediaCallback {
     void onError(Exception exception);
+
     void onLoadMedia(List<?> media);
 }