As a career musician I’ve never heard a piece of Benjamin Franklin’s music in my life. I didn’t even know that he composed until this comment. The link you provided has no examples of his music to listen to or to read.

Without any examples of his work it’s hard to believe that they are of any consequence. I don’t think anyone can just write a piece of music, but you don’t present a strong case that anything he wrote is even remotely worthwhile.

Hell, Bruce Willis has a band that’s released records. I just don’t see any reason to think they’re worth listening to over anyone else.

I'm not being ironic. Your article says he composed two pieces and his instrument skills were "modest". I suspect most people are modest at the hobbies they dabble in. That doesn't make a "universal genius".