This instrumental simply called 4 by The Cruel Sea
https://www.youtube.com/watch?v=h5wI_ZdhdYs

And this instrumental Wedding Cake Island by Midnight Oil.
https://www.youtube.com/watch?v=j3FQwovIJw0

It's weird, I love Tex Perkins and Peter Garret, both amazing front men.
But my favourite Cruel Sea and Oils songs are these instrumentals without the front man.