What should I sing (or say) to myself?

I work long hours and can find myself alone for good stretches. I don't like to spend too much time with my inner monologue, and I haven't reached a level of mindfulness to shut it off, so I've been singing to myself. Rocky Top by the Osborne Brothers and Loch Lomond by the Corries have been my favorites. With songs I think folk music works well for its repeating melodies. Also, my brother has sung these songs for hours on end throughout my growing up, so they're in my heart already. I also keep stumbling through Hedy West's Little Sadie and The Stanley Brothers' Over in the Glory Land. Otherwise, I memorized a poem in Russian (Я вас любил by Pushkin) for a class last year, and had previously memorized one in German (Künstlers Abendlied by Goethe). I've still got the former, but will have to refresh my memory on the latter.

I'm wondering what things y'all have memorized or what you think would be cool or fun for me to memorize and rehearse (or meditate over if it's a thinker) during work.

I like the sounds of other languages and have some familiarity with Russian, German, and Chinese. I have a good ear tone-wise, so I'd take a hearty string of notes if there's one that gets to you. I have taken a liking to stoicism over the past year, and also would read any religious text that has a bit of rhythm.