It's so hard to choose just one! But if I have to, I'd say one of his unreleased: Hear Me Out. It's said to be his very first song but idk. The lyrics resonated with me all throughout my high school years when I officially found a passion for music! I felt like no one understood UNTIL I heard it. I already loved Jon, but that song made me feel comfort in knowing that there was true empathy in his music. But like I said, after being a fan for almost over a decade, it's hard to choose one. You can listen to Hear Me Out on SoundCloud (you'd be able to hear serious growth in his production and writing/singing from then to now lol... but) Give it a listen to if you haven't already!