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Thurl Ravenscroft. You could always pick out his voice in the chorus in Disney movies. He also sang "You're a Mean One, Mr. Grinch," though Boris Karloff did the speaking parts.
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@AlphaCentauri @Render You know who's a close second to Thurl, for me anyway? John Carradine. For this, from the awful Coleman Francis movie of the same name as the song, but aka Red Zone Cuba. Thanks, MST3K.
https://www.youtube.com/watch?v=BYl_YzcJMKU