I think Christine's dropping of Songbird has to do with her hand.
Maybe Seven Wonders was dropped because Stevie is trying to preserve her voice a bit. It must be really tough to sing night after night the way she is doing and not risk some decline in energy, etc. Her soar throat issue has happened on several of the band's big tours before. So maybe she's using a tad of prevention as medicine, scaling back a wee bit.
I personally wouldn't mind seeing some of the vocals dropped in favor of instrumental extensions on the songs, a little bit of jamming and some inspired set-piece solos maybe? I wish.
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