Audio not playing in tkinter?

Question

Python

from tkinter import *
from tkinter.ttk import *
from tkinter import filedialog as fd
from mutagen.mp3 import MP3
import ntpath
import datetime
import pygame
from pymsgbox import *

def open():
  global fileName, org_timeMinutes, org_timeSeconds
  filePath = fd.askopenfilename()
  fileName = ntpath.basename(filePath)
  root.title("Simple Audio Player: Selected: "+fileName)
  f = MP3(filePath)
  org_timeDuration = datetime.timedelta(seconds=int(f.info.length))
  org_timeMinutes = str(int(org_timeDuration.seconds / 60))
  org_timeSeconds = str(org_timeDuration.seconds - int(org_timeDuration.seconds / 60) * 60)
  print(org_timeMinutes + ":" + org_timeSeconds)

def play():
  root.title("Simple Audio Player: Playing: "+fileName)
  pygame.init()
  pygame.mixer.music.load(filePath)
  pygame.mixer.music.play()

root = Tk()
root.title("Simple Audio Player")
root.geometry("600x350")
root.resizable(False, False)

openButton = Button(text="Open", command=open)
openButton.pack()

playButton = Button(text="Play", command=play)
playButton.pack()

root.mainloop()

I am making my own audio player in python. I ran into a problem that pygame does not find a variable with the path to the audio file. Can you help in any way?