Update app.py

app.py

@@ -36,13 +36,22 @@ def Generate_POP(song_length,
     
     #==================================================================
 
+    SEMITONES = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"]
+
+    SCALES = ['Minor', 'Major']
+
+    #==================================================================
+
     print('=' * 70)
     print('MuseCraft AlgoPOP Generator')
     print('=' * 70)
 
     print('Generating...')
 
-    pop_piece = algorithms.write_pop(scale('C', 'Major'))
+    pop_piece = algorithms.write_pop(scale(SEMITONES[song_semitone_key], 
+                                           SCALES[song_scale]), 
+                                     length=[song_length-1, song_length]
+                                    )
 
     midi_data = write(pop_piece, save_as_file=False)