All the things you are - Jerome Kern
Like many Jazz chord sequences, "All the things you are" changes key frequently. But played back step by step in Harmony Space, the ingenious scheme behind this chord sequence becomes plain.
Jazz standards from this period often have 32 bars, each bar with a new chord, arranged in 4 lines of 8 bars. In each line of 8 bars you are typically supposed to be home by chord 7, which gets repeated for chord 8 (this is necessary to give some stability amongst all the changes of key).
The chord sequence kicks off with a standard dominant powered trajectory
IV II V I IV (oops - the fifth chord overshot the target! If it continues moving in the same way it will never get home in time!). The ingenious trick is that we keep the same trajectory but just move the goal post by means of a key change, so the chord sequence drops into the net as V I in the new key bang on time for the sixth and seventh chords.
We then do it all over again - but as a lovely touch, the key window shifts underneath the new home chord I turning it into a VI so that we can repeat the pattern all over again. This takes care of the first 16 chords. Then we have plain old turn around, followed by a beautiful new horizon (we slide down a semitone from I, but change key so that it works as a II V I. Then we start all over again, but cap it off with a long chromatic cadence. Perfection.