It was a poignant tale of grief and loss.

Three years later, Dynamite showed a totally different extreme of their music, going for dance-floor kicks.

Spring Day is one cherished by their most hardcore fans as their greatest moment.

NEW YORK, NEW YORK - FEBRUARY 21: K-pop boy band BTS visit the SiriusXM Studios on February 21, 2020 in New York City. (Photo by Cindy Ord/Getty Images for SiriusXM)

K-pop boy band BTS visit the SiriusXM Studios on February 21, 2020 in New York City.Cindy Ord/Getty Images/SiriusXM

Its our celebration of the greatest songs ever made and a breakdown of what makes them so great.