What is the theme of Lay that Trumpet in your Hands?

It seems you're asking about the theme of a piece of music, but you haven't provided a piece with that title. There's no known musical work called "Lay that Trumpet in your Hands."

Could you please clarify:

* Are you sure about the title? Did you perhaps misremember it?

* Can you provide more context? Is it a specific composer or genre? A particular era or style?

With more information, I can help you identify the theme of the piece you're looking for.