There were lyrics and Lorne Greene sang the theme to "Bonanza"

As a kid, I heard Lorne Greene sing the theme to Bonanza, but every time thereafter I saw the show the theme was merely instrumental. Today I woke up to "With a gun and a rope and a hat full of hope, planted a family tree" stuck in my head and I knew it was time to search YouTube.

Evidently, Andy Griffith also had lyrics: