Why does the output prints put "None"? Python [duplicate]

here is my code im trying to print out random song from the user's input choices:

import random
n = int(input("How many song?: "))
song_name = []
for x in range(int(n)):
  ask_song = input("add a song: ")
  sing = random.shuffle(list(ask_song))
  song_name.append(ask_song)
print("here: " + str(sing))