Who sang to the spirits of Cora and Uncas as they traveled bless hunting grounds?

The question you're asking is related to James Fenimore Cooper's novel "The Last of the Mohicans." However, the details of the question are slightly off.

Here's the corrected version and answer:

* Who sang to the spirits of Cora and Uncas as they traveled to the Happy Hunting Grounds?

The answer is Chingachgook, the Mohican who is the father of Uncas.

In the novel, after Uncas is killed by Magua, Chingachgook carries his son's body to the top of a mountain to let him pass into the Happy Hunting Grounds. He sings a mournful song to guide Uncas' spirit to the afterlife.

Important note: Cora Munro (not Cora) does not pass into the Happy Hunting Grounds in the novel. She is captured by Magua and her fate is left ambiguous at the end of the story.