I've been following the show on youtube. I was shocked when I heard Bo's choice of song b/c I've been liking her performances so far. I have to say it wasn't that bad at all as I didn't expect her to equal or surpass Coldplay. The purpose of the show is to display your vocal abilities and I believe she achieved that. She can probably sing the phone book and make it sound cool.
Now that Ruth is gone, I think it's between Bo and Tyler.