The duo will appear near the end of the season.
The entire company for the upcoming NBC broadcast has been announced.
Current On the Town star Jay Armstrong Johnson also appears in Stephen Sondheim and Hugh Wheeler's musical on Live From Lincoln Center tonight.
Levi is executive-producing the project along with Eva Longoria.
Let's hope she gets to sing.
The shows will be seen as part of the new Theater Close-Up series.
Conlee will take on the role of The Commodore, previously played by Dabney Coleman.