Not exactly "neat" key changes - but unusual "butt-joint" key changes:
The HEE-HAW version of "I Never Picked Cotton" sung and played by Roy Clark. IIRC, solo.
The way he did it HAD NO CHORD CHANGES, only key changes.
Other people's versions I find on YouTube they throw in a mild I-IV-I. However:
IIRC Roy's version on HEE-HAW went thru the verse in E (and only E!) then up a 1/2 step and go thru the next verse in F, following verse in F#
(maybe up to G then - I ferget how many verses haha) then back down F#, back to F, back to E.
In other words, if you had one of those rolling capos and knew ONLY the basic E chord, you could play "I Never Picked Cotton" ... "but my Daddy did" ... etc. btw Lots of reality in that song. One chord and the truth. Those rows look awful long, like miles long.
OK. This isn't a "neat" key change either...however...at 3:30 JB calls out for a key change from F to D. Three 1/2-steps = always a cool key change. ime btw the audio is good, and the concert visual is good, but they don't synchronize after a bit