'Only Remembered' as a hymn is in 4.
So too in War Horse yet Tim van Eyken manages to slip neatly from 3 to 4 in the first verse here
https://youtu.be/dEa4zueeAoo 
I wonder if he intended to start like that ;-)?

CoopBoyesSimpson do it in 3.
https://youtu.be/uyoJn8Ebb7I 



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I love the 3x3 of a slip jig for not giving the chance of a breath here!
Arthur O'Bradley :
https://www.youtube.com/watch?v=Qi71lWaqC1Q