I have a favourite medley , all based on the quickstep style but with different instruments based on the registrations. I just segue from one tune to the next by hitting the registration button at the end of the last bar of the tune.

Lady is a Tramp
Whispering
Margie
Mister Sandman
(Back Home Again in) Indiana
I'll See You in My Dreams

Same again in Slow Foxtrot tempo:

Guilty
Don't Blame Me
Someone to Watch Over Me

And in Big Band Ballad:

Misty
Deep Purple
Stardust

You can stretch that lot out to a whole set.