up the Tree" and "You're a Mean One, Mr. Grinch". The last of these was performed by Thurl Ravenscroft; the other two were performed by a chorus representing the voices of the Whos. None of the vocalists were credited at the time. On December 18, 1966, MGM released a soundtrack LP in conjunction with the television special. CD releases include albums produced by Island (1995) and Mercury Records. In the recorded version, Boris Karloff does all voices including Cindy Lou Who. The song "You're a Mean One, Mr. Grinch", which comically describes the level of the Grinch's despicable nature, includes all verses with their original rhyming lyrics and the isolated song tracks have different durations due to being re-recorded. On October 5, 1999, Rhino Entertainment released a new CD soundtrack (which included the soundtrack for another Dr. Seuss cartoon, Horton Hears a Who!). Both story collections contain selected dialogue and music numbers. The "isolated music tracks" in this edition are taken directly from the television soundtrack and are not the re-recorded tracks from earlier versions. The dialogues are the originals, being voiced by Boris Karloff for "Grinch" and Hans Conried for "Horton". Because Thurl Ravenscroft was not credited in the closing credits of the 1966 television special as singing the song "You're a Mean One, Mr. Grinch", it is sometimes attributed to Boris Karloff. After becoming aware of this oversight, Seuss himself called Ravenscroft and apologized profusely and later wrote letters to columnists nationwide telling them that it was Ravenscroft who provided vocals for the musical number. Ravenscroft would become a staple in several of Seuss's later television specials, voicing one of the Wickersham Brothers in Horton Hears a Who and a factory worker in The Lorax. Karloff received a Grammy Award in the Spoken Word category—the only major performing award of his career—for the album. Prequels and follow-ups A television special called Halloween Is Grinch Night, created by DePatie–Freleng Enterprises, aired on ABC in 1977, eleven years after the Christmas special. This special involved a tale of the Grinch coming down to haunt the Whos every Halloween. Though less successful than the original, it was awarded an Emmy. A later cartoon, The Grinch Grinches the Cat in the Hat (alternatively titled The Cat in the Hat Gets Grinched), aired on ABC in 1982. Though credited to DePatie–Freleng, it was produced by Marvel Productions, which had taken over DePatie–Freleng in