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Ariel, Zoey & Eli wrote and recorded a superhero theme song for Chad Carr, the 4-year-old grandson of former Michigan coach Lloyd Carr who has been diagnosed with an inoperable brain tumor.

A video of the song, "Chad Tough," was released Tuesday on YouTube.

The song was recorded last week at Big Sky Studio in Ann Arbor, and Lloyd Carr, Frank Beckmann and the Michigan basketball team, among others, contributed to the project.

The song is available for purchase on CDBaby, iTunes and Amazon, and all proceeds will go to Chad's family to help cover medical costs.