Debra Messing and Christian Borle
I wish we would have gotten to hear them sing more on the show...more so Debra, since she only had the one song..and small bits on "Under Pressure" and "I Never Met a Wolf who Didn't Love to Howl". There could have been so many duets between Julia and Tom besides "The Right Regrets"...they could have done it similar to how Tom had to sing "Don't Say Yes Until I Finish Talking"...they wrote the songs, they would have to teach them to everybody.
I would have loved to hear a full version of them singing "Mr. & Mrs. Smith". They started to in the episode "Enter Mr. DiMaggio", and it sounded great, but then they stopped and started talking.
Anybody else agree with me?