Isn't that the same girl from the last vid?
Probably their baby sis.
Nice song, they're getting better and more refined all the time.
Having heard their four CDs more intensively now and over proper stereos, I can attest to the fact that Francesca's E string has a much lower signal than her other strings. Alas!, the curse of a double bass.
It's a bit like listening to old Status Quo albums, you could always hear when Alan Lancaster hit the E string on his Mustang, the signal was much weaker than on the A string. He came to use it as a style element in his playing.
