In the event where you increment the player's score just add the action "play sound" and select the sound file you want to play. You have to use the "Audio" plugin, and you also have to import a .wav file into your Construct 2 project.
Your file you provided the link for is a .m4a file, to use it in Construct 2 you have to convert it.
Here's a file converter that will convert your .m4a file to .wav:
http://www.zamzar.com/convert/m4a-to-wav/