it's possible play a music when you see a enemy(see int he screen)

i follow a video can i share it?
btw the name is Unreal Engine 4 Tutorial : AI Navigation - Chase and Roam
Of totally unreal
Btw i didn’t solve ahahahha
I created a monster that walks for the level
http://s28.postimg.org/ersh6tint/Immagine.jpg
and when he see you he chase you
http://s22.postimg.org/vpqcgd8u5/Immagine.jpg
Now i put the play sound but the sound is ever played so many times and not 1 times and why when i shake off the monster he stop to roam?