The Living Sisters are rather enigmatic. Information on them is scarce, and it’s hard to find a reason why considering this trio of vocalists are about as good as "supergroups" can get. Inara George (of The Bird and the Bee), Becky Stark (of Lavender Diamond) and Eleni Mandell (of …Eleni Mandell) make up what is seemingly a throwback pop outfit (we say "seemingly" because only one track exists in the ether, "How Glad I Am," featured on their MySpace page) — and they’re sharing the stage with Brian Wilson on December 6th at Disney Hall. In this age of over saturation, consider this a rare kind of intrigue.