Is Raymond Scott's tune, "Powerhouse," or others he wrote in the public domain-?

No. All Raymond Scott compositions are still under copyright protection. Under current copyright law, titles copyrighted before 1978 are protected for a period of 95 years from the date of first copyright.

"Powerhouse" dates from 1937, and will not enter the public domain until 2033. Scott's earliest copyrighted title ("You're My Lucky Charm") dates from 1933, and many of his electronic recordings from the 1950s through the early-'80s were copyrighted after his death in 1994. More.

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