Lin-Manuel Miranda prepping song that is 'a love letter to Puerto Rico' to benefit hurricane relief

— -- "Hamilton" creator Lin-Manuel Miranda is working on an all-star record to benefit hurricane-ravaged Puerto Rico.

More than a week after the storm, the U.S. territory is still largely without power, with many of its 3.5 million residents in need of food, drinking water, gasoline and other supplies.

On Thursday, Miranda posted a series of Twitter videos showing himself working on the song in a studio with Latin music legend Ruben Blades, "Hamilton" cast member Anthony Ramos and rapper Joell Ortiz of the group Slaughterhouse.

"It's a love letter to Puerto Rico," Miranda told CNN of the song.

"Puerto Ricans, that's 3.5 million American citizens, just like Texas, just like Florida," he said. "I know there's a tendency for fatigue because we've just been through two hurricanes. And we can't be fatigued when it comes to our fellow Americans."

Although Miranda is keeping details of the song and the full list of collaborators under wraps, CNN reports that the song will be out on Oct. 6.