Things are gettin' retro for the fourth installment in The Boot's Grace & Tony Greenroom Sessions video series, as the duo and their special guest take on a Bob Wills classic.

'Deep Water' was a hit for Wills in the late 1940s, and for this cover, Grace & Tony and special guest, Odane Whilby, share the vocals.

"We first discovered Odane while sharing a bill in White's Creek, Tenn. ... [and we] instantly fell in love with his voice, as well as his style and charisma," Tony says. "[It] was fun to throw him a curveball with the old Bob Wills tune."

And, no, your eyes aren't deceiving you. Grace & Tony and Whilby are, in fact, playing in an elevator -- an old elevator backstage at Subculture in New York City, to be exact.

"[It] was a very cool setting," says Tony.

Visit Grace & Tony's official website for more information on the duo and their music, and check in with The Boot on the 1st and 15th of June for two new videos in this collaborative series!