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Scatman John died on December 3, 1999. He was a singer and songwriter who was known for his unique scat singing style. His most famous song, "Scatman (Ski-Ba-Bop-Ba-Dop-Bop)", was a worldwide hit and helped to popularize scat singing. John was diagnosed with amyotrophic lateral sclerosis (ALS) in 1996 and died three years later at the age of 57.