Jack Black Sings School of Rock Song to Fan With Rare Disease

Jack Black is going viral for serenading a young, sick "School of Rock" fan with a song from the movie.

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Jack Black Sings 'School of Rock' Song to Young Fan Battling Rare Disease

Funnyman Jack Black and son Samuel Black leaving Beverly Hills Park Los Angeles, California - 26.08.08 Stock Photo - Alamy, jack black son

Jack Black sings Taylor Swift song at fundraiser while in his underwear

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Jack Black sings legendary song to young School of Rock fan who has rare disease

Watch Jack Black Serenade Young Fan With a 'School of Rock' Song

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Jack Black Sends Video to Kids Doing 'School of Rock' Musical, jack black escola de rock

Funnyman Jack Black and son Samuel Black leaving Beverly Hills Park Los Angeles, California - 26.08.08 Stock Photo - Alamy, jack black son

Jack Black Sends Video to Kids Doing 'School of Rock' Musical, jack black escola de rock

Watch Jack Black Sing A School Of Rock Song For A Sick Kid (And Bring Your Tissues), jack black escola de rock