Let's say you were some sort of aspiring Dr. Frankenstein of music. In your experiments, you were able to combine the talents of Jenny Lewis and Tegan and Sara, throw in a little extra emo, then place these talents into two identical Jessica Albas. Let's go further to say that you were able to survive the rip in space-time that you just created from the sheer mass of all that adorable. What you'd be left with in your musical petri dish would very likely be something similar to Meg and Dia.