Wow - did nobody else watch this last week? I know there was a lot of competition, but this was my choice for the night. Unfortunately, I wasn't able to watch the whole show. Only saw the first 4 groups. And my recording got deleted somehow. But of the groups I saw, I REALLY liked the all-girl group who sang Bruno Mars' "Grenade."
I found a review of the show. The all-girl group I like is Delilah, and that appeared to be the reviewer's favorite too. The groups sent packing were The Fannin Family and Cat's Pajamas.
Just rewatched Delilah's performance on youtube. Even better than I remembered!