Mary Bee and Kate Steinway live stream on Facebook.
They're performing again with Chloë very soon this month (as in this Friday, Sept 16, at 7 PM EDT). I'd guess that's gonna get streamed on Facebook.
I feel like I should also mention that while these girls sounded great when I first heard them earlier this year, they've been getting better and better, including their harmony, which is getting pretty spectacular. They sound great together!
Mary Bee has a sweet, smooth voice and Kate has pretty impressive range. Kate holds back a little bit because the arrangements and harmony call for a soft and subtle voice. But she has a tremendous amount of power in those pipes.
Just for you, here's one of their live streams:
https://www.facebook.com/kateconnaghanmusic/videos/1835275733372083/What a Wonderful World has a really nice ending (near the start of the video).
The one at around 18 minutes in is also a must-listen. Incredible harmony!!