Mob Attack Sounds?

Aight, so I made a new rideable mob that doubles as a weapon, and a mode of transport. At first, it was a very ridiculous idea I thought to myself but then I wanted it done. But what is this creation you might ask? It needs no introduction:

The Lawnmower From Hell.

If you haven't guessed, it's based off of the Lawnmower from Hell from a television series known as Mythbusters, specifically from Season 15, Ep 9: Accidental Ammo. Just type in your search "Lawnmower from Hell" and you'll see what I mean!

Apart from that, I want to make it so that when the Lawnmower "mows" down a mob, it creates a sound effect. A sound effect like a lawnmower ripping its target asunder. 'On Collide with Player' won't settle it obviously because it only affects players.

In short, I want a sound effect to play when the lawnmower attacks a mob.

Any help will be appreciated! Even if I have to do some coding. Let it be known that I am NOT afraid of coding, rather it would benefit me to be able to learn more about coding.