Ableton live you can use Invalid Link Removed
And do things like slow down or speed up if the music calls for it and still keep all the backing tracks in sync.
All this in ear, live, backing tracks get more amazing all the time.
Click tracks don't need to be just boring clicks, they can be drum tracks. Drummers don't seem to mind playing along with drums. And little fills into our out of a second can be helpful.
Recorded voices. I took one of those voice readers and had it read a bunch of numbers. Warped them up so they were staccato, which matters for "Seven", "Eleven", and when you get "Twenty". Then I mapped this to a sampler. Midi notes 1, 2, 3, 4 speak "One", "Two", "Three", "Four", just sequence them. And I can do up to 128 bars. 2 separate instruments will give 129 to 256, and so on.
Record "Chorus", "Bridge", and it's another midi instrument. Ableton can now be played and give the queues, A band member conducts it. Simple things like vamps or letting a hot soloist go around a few more times. Cool stuff.