In case you don't remember, HarmoniousKeys also shared a piano version of Hush Now, Quiet Now. And, of course, make sure to visit HarmoniousKeys' Youtube Channel. Thanks for sharing your musical talents!
Update: Here is the sheet music for the duet version, and here is the video. All of this is also on the music page for season one as well. HarmoniousKeys did a great job with these arrangements!