"Another more serious lawsuit involved the magazine's parodies of songs. New lyrics are written to familiar songs and printed with the instructions, "Sing to the tune of ...." When Irving Berlin and a group of songwriters sued Gaines, the case made it all the way to the Supreme Court. "We made law on that one," Gaines recalled, noting that he had probably helped to pave the way for Weird Al Yankovic's parodies. "Now anyone is free to parody anything that way. You just can't publish the music.""
January 1, 1970
https://en.wikiquote.org/wiki/Mad_(magazine)