Im reasonably new to coding, but maybe try changing

AudioSource.Play("Name Of the Audio");

to

audio.Play();

and add an audio source to the object and uncheck 'loop' and 'play on awake'

not too sure, hope this helps.

First, make sure you close the function with a closing bracket }, not another open bracket. Next, as GoThXoRd mentioned, you should use

audio.Play();

with the audio on the game object (you can just drag it on in the inspector, even).

If you are still having troubles, the following must be true for that function to work:

• Both game objects must have colliders
• One game object must have a rigidbody (See the bottom of this page)
• One of the colliders must be a trigger
• The physics collision layers should be on

If you don't want the collider to be a trigger, use OnCollisionEnter()