pumpitupparty.com

VMP1Z TIL in 1935 "Happy Birthday to You" was copyrighted with a value of 5M making it illegal to sing. In 2016 a federal judge ruled that the copyright was not valid and the song had no other claim to copyright, placing it in the public domain, and making it free to sing for all.
loV6V TIL that the Tune of Happy Birthday is actually a remix