She could replicate the background vocals live...that is up to her/band, their manager and their sound techs, etc. But it can be done. She also has the option of using back up singers on tour. It is sad that so much "work" is done in the studio, but it does separate the truly talented from the not so talented. My opinion is I like the music. What bores me is they have the same formula. It sells, but I do get tired of it. Slow...JAM...blah...blah. But, hell, we all need entertainment, so it works.
