Yes, Meav will be sorely missed...She was my sister's favorite and close to mine too (second to Lisa and Mairead). However, Lynn is a very good singer! I found a video of her singing with Lisa on Riverdance. Though they are all singing in an ensemble and Lynn is the "featured soloist", it's hard to hear Lisa (you can if you really try), but Lynn does sound good in ensemble.
As for Alex, she's only temporary until Lisa comes back from maternity leave, right???
Here's the video.
Lynn starts singing at 1:46, Lisa is in the front of the ensemble, see if you can spot her. 3:28 is when the singing ends.
Lynn is the one with the crown.
Enjoy!!!
http://www.youtube.com/watch?v=t26UA4INTcs