Love the suggestions so far! From the piano side of things, I'd add "Boogie Woogie Bugle Boy" by The Andrews Sisters - it's got that swinging military rhythm that's actually really fun to play. And "Taps" arranged for piano or guitar is hauntingly beautiful, even though it's technically a bugle call.
Also seconding "Where Have All The Flowers Gone" - one of those songs where the simplicity of the chords (mostly C, Am, F, G) lets the lyrics do all the heavy lifting. Pete Seeger knew exactly what he was doing with that circular structure.
Good choices as well Lisa, will add those suggestions as well. I love Boogie Woogie Bugle Boy, the Andrew Sisters totally awesome in this one. And by the looks of it, your one and same person or 2 people in the same household with Mike/Lisa having the same IP address ![]()