It's so clear if you watch the videos that the choruses and certain verses are "enhanced" by pre-recorded vocals. And it's obvious that Christine is barely playing her instrument, save for some basic chords now and then.
This saddens me, but I guess they don't want their limitations (brought on by age) to affect the show.
And, no, I don't think Stevie uses backing tracks. I don't think she'd be able to. She can barely remember the words to her own songs and she often misses cues. She'd always be three verses behind the track.....
