It happened on December 8, 1994.
Watch the very first performance of the what is now a holiday classic, Mariah Carey's "All I Want For Christmas is You," which was recorded at The Cathedral of St. John the Divine in New York.
The story behind the song is that it supposedly only took Mariah and her writing partner 15 minutes to compose the song. That was in August, and to get in the holiday mood, Carey had decorated her house, even though it was the middle of summer, for Christmas.
Reportedly, this one song has earned Mariah Carey $60 million dollars!