1.The Day the music died, A plane carying Buddy Holly, Ritchie Valens, and J. P. Richardson crashed and they died,
A reference to it was the song, American Pie by Don Mclean.
2.Slang a very sad day, Like the day the music died.
Person 1: Wasn't February the 3rd sad
Person 2: Yes it was and I loved that music
Lonely Guy: Today feels more like February 3rd than March 9th