From the White Album, like so many others have already hoped for....
CRYSTAL!!! That would be so cool to see them do this one live.
"How the faces of love have changed...turning the pages" 
Really nothing from Rumours...they do so much from that one already!
Tusk -
ANGEL ...Stevie kicking up her heels and Lindsey with his big grin watching Stevie "get into it". Lindsey joins Stevie at the mike for the chorus at the end....bring back memories?!
Mirage - As long as they do
GYPSY I'll be ok with this one.
Tango In The Night -
SEVEN WONDERS . I like the way they "played" with each other on the video.
"So long ago...it's a certain time, it's a certain place". When I See You Again would be cool too but that's a bit of a stretch I think!!
Crystal would be my BIGGEST wish, but the suggestions of having Stevie & Lindsey do some songs off of BN(
FROZEN LOVE & RACES ARE RUN) would be up there too!!
Joe