Why did they split? Artistic differences?
I like some Morricone when he does something different like Sky Full of stars, Companeros, Nobody. But Ican't help but find his later Leone type scores so corny. In fact, they are what ruins many scenes in OUATITW for me. When Leone pans up above the building to reveal his grand western town, and the music builds with it, I think it shows how big Leone wanted this film to be and when it shows so obviously, it completely ruins all feeling I may have towards it. But his tunes in other sections are great. Such as the massacre. I get goosebumps everytime.
And I'm surprised Morricone had such a nack for comedy westerns when he had made his bones in deadly serious spaghettis.