I play the harmonica. I'm not terribly good at it, but there is a story as to why I took it up. Many years back my grandfather bought a run-down old building with the intention of fixing it up into a dance club. I was invited to help out by pulling up old carpeting, along with other minor functions. Why ask me to help? I was cheap labor. Only cost him twenty bucks and a hug. While wandering around backstage I came across a busted up old harmonica on the floor, and without thinking much about it I picked it up. I showed it to my grandfather and he was totally cool with me keeping it, so, I did. After thoroughly washing the blasted thing, I eagerly put it to my lips... and out flowed the craziest amateur polka you've ever heard. I thought it was hilarious for some reason, so I continued to play. I never learned how to read music, or to manage any actual songs... but I had a lot of fun.
The club was dubbed "Headliners" and became a huge success. My grandfather eventually sold it though, I think.
I can also sing with a certain measure of talent. There isn't a weird origin story behind it though. I was simply cursed with a boyband voice, and I sang in the shower for so many years that I inevitably became quite good at it.