@Dinozzzo and Kimberly: Órlagh is most likely a light mezzo-soprano
About the girls' height (even though it's slightly off-topic): Deirdre is taller than Méav so she is most likely about 5ft8 or 5ft9. Méav and Lynn are about 5ft7 (even though they appear taller), Hayley is 5ft6 and Lisa K is 5ft5. As for the other girls... I'm pretty sure Alex is 5ft4. And Mairéad N is a little shorter, somewhere between Mái N and Alex. I assume Susan is about 5ft5, Órlagh about 5ft4 or 5ft5. Chloe is at least 5ft6, probably 6ft7 or even 5ft8, I'm not really sure. And Lisa Lambe's height is a mystery. Seriously, she is the girl of ever changing heels and sometimes tiny and sometimes tall beside the other girls. I think she is about 5ft5 though, but I'm not sure, because she could also be 5ft3 or 5ft7 *cough* Hope that helped