Death Rides a Horse (1967)
Here’s a 1967 spaghetti western with Lee Van Cleef and John Phillip Law. Bill Meceita, a boy whose family was murdered in front of him by a gang, sets out 15 years later to exact revenge. On his journey, he finds himself continually sparring and occasionally cooperating with Ryan, a gunfighter on his own quest for vengeance, who knows more than he says about Bill’s tragedy.
The main theme of Death Rides a Horse is used in Kill Bill.yt: