[Python] Pygame can open .ogg file in one scope but not in another

In a python script . . .

def control_audio():
global audio_flag
print("audio toggled")
audio_flag = not audio_flag
if (audio_flag == True):
on_msg_button = "/home/mrmoto/Documents/now_speaks.ogg"
pygame.mixer.music.load(on_msg_button)
pygame.mixer.music.play()
amp_mute.on()
while mixer.music.get_busy():
pass
amp_mute.off()
client.publish("audio_state", "on")

if (audio_flag == False):
off_msg_button = "/home/mrmoto/Documents/moto_silent_2.ogg"
pygame.mixer.music.load(off_msg_button)
pygame.mixer.music.play()
amp_mute.on()
while mixer.music.get_busy():
pass
amp_mute.off()
client.publish("audio_state", "off")


moto_silent_2 can be opened and played as it should. However, in the same script

def on_message(client, userdata, message):

if (message.topic == "mrmoto_alerts"):
global lasttimeA
global eventsA
global lasttimeB
global eventsB
msg = message.payload.decode("utf-8")
if (msg=="prione"):
eventtime = time.time()
if (eventtime - lasttimeA >= 10):
eventsA = eventsA + 1
e = datetime.datetime.now()
eventStr = ("PIR1 EVENT {:d} {:%Y-%m-%d %H:%M:%S} \r\n".format(eventsA, e))
lasttimeA = eventtime
log_event(eventStr)
a_msg = "/home/mrmoto/Documents/hallway.ogg"
play_msg(a_msg)
log_event(eventStr)


if (message.topic == "mrmoto_alerts"):
msg = message.payload.decode("utf-8")
if (msg =="pritwo"):
eventtime = time.time()
if (eventtime - lasttimeB >= 10):
eventsB = eventsB + 1
e = datetime.datetime.now()
eventStr = ("PIR2 EVENT {:d} {:%Y-%m-%d %H:%M:%S} \r\n".format(eventsB, e ))
lasttimeB = eventtime
log_event(eventStr)
b_msg = "/home/mrmoto/Documents/laundry.ogg"
play_msg(b_msg)
log_event(eventStr)

if (message.topic == "audio_check"):
global audio_flag
if (audio_flag == True):
client.publish("audio_state", "on")
if (audio_flag == False):
client.publish("audio_state", "off")

if (message.topic == "command"):

msg = message.payload.decode("utf-8")
if (msg == "audio_off"):
log_event("audio off by command\r\n")
audio_flag = False
off_msg = "/home/mrmoto/Documents/moto_slient_2.ogg"
pygame.mixer.music.load(off_msg)
pygame.mixer.music.play()
amp_mute.on()
while mixer.music.get_busy():
pass
amp_mute.off()
client.publish("audio_state", "off")

if (msg == "audio_on"):
log_event("audio on by command\r\n")
audio_flag = True
on_msg = "/home/mrmoto/Documents/now_speaks.ogg"
pygame.mixer.music.load(on_msg)
pygame.mixer.music.play()
amp_mute.on()
while mixer.music.get_busy():
pass
amp_mute.off()
client.publish("audio_state", "on")

if (msg == "is_moto_running"):
client.publsh("moto_state", "running")


Pygame throws the error

pygame.error: Couldn't open '/home/mrmoto/Documents/moto_slient_2.ogg'


I have no idea what is or might be going on. Can someone see an error? I know the code is not pretty . . . it was supposed to be a quick experiment.

control_audio() is responding to the push of a button on a device. on_message() is responding to MQTT messages sent from an iOS app

Code is running on a Raspberry Pi Zero W

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