Funnily enough, that's the one our cab driver had us listen to when he didn't know the Tony Christie song. He assumed it was the one we were talking about with regards to an Amarillo themed song. When we played him the Tony Christie song, he was both intrigued and stunned it was popular.
Sorry...
If you get to Amarillo, don't sing the song. They don't know it. Or care for it.
The Big Texan Stakehouse is amazing though! Their OAP buskers aren't very good, or knowledgeable about music though. They, apparently, don't know of Rhinestone Cowboy. Nonsense.