Jesse L. Martin — formerly of Law & Order fame and currently on The Flash — is also a Broadway veteran (RENT, anyone?).

He’s also partnered with Rick Cosnett and Carlos Valdes, two of his Flash co-stars, for a Kickstarter project called “The Letter Carrier”. The musical short film would tell the story of a black family hiding from slavery in the Blue Ridge Mountains in the 1860s.

Joss Whedon reportedly donated a large sum of money to the $50,000 production and to show his appreciation, Martin, Cosnett, and Valdes sang an a cappella version of “The Ballad of Serenity.”

[via Boing Boing]