Add references to cls Music of packages class.

Author: MicheleCarbonera

music.py

@@ -29,23 +29,22 @@
 import os
 import sox
 import time
-from musicPackages import MusicPackageManager,MusicPackageInterface,MusicPackage
 
 class Music:
-
+    _instance = None
     managerPackage = None
 
     noteDict = {
         'C2': -7.0, 'D2' : -5.0, 'E2' : -3.0, 'F2' : -2.0, 'F#2' : -1.0, 'G2' : 0.0,
         'A2' : 2.0, 'Bb2' : 3.0, 'B2' : 4.0, 'C3' : 5.0, 'D3' : 7.0, 'E3' : 9.0,
         'F3' : 10.0, 'G3' : 12.0
     }
-    _instance = None
+    
 
     @classmethod
-    def get_instance(cls):
+    def get_instance(cls,managerPackage):
         if cls._instance is None:
-            cls._instance = Music()
+            cls._instance = Music(managerPackage)
         return cls._instance
 
     def __init__(self,managerPackage):

musicPackages.py

@@ -83,7 +83,14 @@ def getIcon(self):
         return self.icon
 
 class MusicPackageManager:
+    _instance = None
     packages = None
+    
+    @classmethod
+    def get_instance(cls):
+        if cls._instance is None:
+            cls._instance = MusicPackageManager()
+        return cls._instance
 
     def __init__(self):
         self.packages = dict()