The tempo was a bit on the slow side, but I really like the harmony in the women's choir. To improve, I'd like to hear more of the phrasing that's on the original recording. Not all of the quarter notes should be sung straight. Some are rushed, and some lay back a bit.
In this recording, the chorus had turned around and sang directly to the band on stage, so the microphone was behind them. I don't think balance will be an issue as long as the trumpets keep bells in the stands and the woodwinds take it easy on the volume.