Michael May

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Carl Luepker was 10 years old when he first noticed his right hand twitching slightly when he played piano. It was like it had a mind of his own.

When he was 12, doctors diagnosed him with a degenerative nerve disease called dystonia. The disorder causes nerves in the brain to misfire, causing uncontrolled muscle spasms that get worse over time.

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The 42-year-old rapper Killer Mike, of Run The Jewels, and the 75-year-old funk legend George Clinton, founder of Parliament and Funkadelic, may be from different generations, but it turns out they have a few things in common.

The 42-year-old rapper Killer Mike, of Run The Jewels, and the 75-year-old funk legend George Clinton, founder of Parliament and Funkadelic, may be from different generations, but it turns out they have a few things in common: They've both created music that seemed commercially risky at first, yet ended up transcending genres and creating a new audience.