According to Billboard's Tamar Herman, "All Night" is a nu-disco tune in the style of a bubblegum pop song that features a 1980s vibe with "thumping" bass and "twinky electronic" melody.
[1] Jacques Peterson from Idolator described the track as "funky nu-disco" that turns "a teenage slumber party into Studio 54.
[3][4] A documentary-style music video for the song was released on August 4, 2017, featuring in between mini-interviews of the eight members reflecting upon their career, interspersed with scenes of the girls having fun and dancing in a disco club.
The video ends with clips from the early days of the group, which offers up "a quick trip down memory lane of what is now one of K-pop's most legendary acts", according to Billboard's Tamar Herman.
Idolator's Jacques Peterson wrote, "Even if you don't listen to K-Pop, these tracks ["All Night" and "Holiday"] are absolute must-haves for any pop playlist this summer.