So we knew that the guys on CW’s “The Flash” could hold their own against metahumans, but did you know they could harmonize?

It’s no surprise that Jesse L. Martin can sing like a pro. He’s a seasoned Broadway vet – “Rent” anyone? So he’s working on a musical project called “The Letter Carrier” and Joss Whedon just made a pretty big donation.

So he decided to say thanks by doing an awesome acapella version of the opening theme to “Firefly.” And it’s fantastic. So good job, Detective West, Eddie Thawne and Cisco.