diff --git a/app/musicmuster.py b/app/musicmuster.py
index 0127189..b469850 100755
--- a/app/musicmuster.py
+++ b/app/musicmuster.py
@@ -13,6 +13,7 @@ from PyQt5.QtWidgets import (
     QInputDialog,
     QLabel,
     QMainWindow,
+    QMessageBox,
 )
 
 import helpers
@@ -198,6 +199,11 @@ class Window(QMainWindow, Ui_MainWindow):
         self.playlist.set_selected_as_next()
         self.update_headers()
 
+    def show_warning(self, title, msg):
+        "Display a warning to user"
+
+        QMessageBox.warning(None, title, msg, buttons=QMessageBox.Cancel)
+
     def test_function(self):
         "Placeholder for test function"
 
diff --git a/app/playlists.py b/app/playlists.py
index 80a26ca..d6ea416 100644
--- a/app/playlists.py
+++ b/app/playlists.py
@@ -221,6 +221,11 @@ class Playlist(QTableWidget):
         if repaint:
             self.repaint(clear_selection=False)
 
+    def can_read_track(self, track):
+        "Check track file is readable"
+
+        return os.access(track.path, os.R_OK)
+
     def create_playlist(self, name):
         "Create new playlist"