Difficult to pick a best track when a band has so many classics in their catalogue... apart from the ones already mentioned, there's "A Town Like Malice", "Eton Rifles", "In the City", "Funeral Pyre", "Beat Surrender", and so on!
Seeing the title of this album reminded me of a conversation I had with an old retired shepherd when I was on holiday at Wasdale Head in the Lake District in the 1960s. He was 85 years old, fit as a fiddle, and he and his dog could outwalk a youngster like me. We got into the habit of doing hillwalks together. One day I said to him "I suppose you use that old Cumbrian Yan Tan Tethera way of counting sheep". He looked baffled and replied "No, I have always counted sheep One, Two, Three!"