who sang this song?
Ariana Grande
One Last Time (Ariana Grande song)
 American singer Ariana Grande
what is the song one last time about "Earth will pass catastrophically through the tail of the comet Eurydice in one week. Gather family and lovers close, one...last...time".
wiki:4903656
One Last Time (Ariana Grande song) [SEP] Introduction
"One Last Time" is a song recorded by American singer Ariana Grande for her second studio album "My Everything". It was written by David Guetta, Savan Kotecha, Giorgio Tuinfort, Rami Yacoub, and Carl Falk. The song was produced by the latter two, with Tuinfort serving as a co-producer and Ilya serving both as a co-producer and vocal producer. "One Last Time" was first released on the iTunes Store on August 22, 2014 as the second promotional single from the album. On February 10, 2015, the song was sent to contemporary hit radio as the fifth and final single from the album.