I was here for this performance and it was amazing. I was so pumped to get to hear Lena do it again this week when I saw her in the role of Hedwig and it was also interesting to hear Darren sing the song when I also saw the show on opening night.
She's getting a bit miffed at him in the beginning, watch how she looks at him as he comes in with the background vocals. Darren is a good singer but not technically on her level. He comes in late sometimes and seems to have a difficult time adjusting his pitch. I say this as someone who has seen both perform the same show live.