The War is the fourth studio album by South Korean-Chinese boy band EXO. It was released digitally on July 18, 2017 and physically on July 19, 2017 by S.M. Entertainment under Genie Music's distribution. The album includes a total of nine tracks including the lead single "Ko Ko Bop". The War received the highest number of pre-orders at that time for a K-pop album, at more than 800,000 physical copies. 24 days after being released, it became EXO's fourth consecutive studio album to have sold over a million copies. The album was re-released under the title The War: The Power of Music on September 5, 2017.

On June 15, 2017, it was confirmed by S.M. Entertainment that EXO will be releasing a new album sometime in mid-July. On June 23, S.M. Entertainment announced that member Lay would be unable to participate in the production and promotion of the album.

On July 8, EXO's official Twitter account was made public, through which S.M. Entertainment revealed the first teaser video for the album. Twitter Music also officially created three customized hashtags with EXO's new tropical logo for EXO including #KoKoBop, #TheWarEXO and #EXO. Fans also welcomed them with 11 Million tweets worldwide. Also on July 8, EXO's official Instagram account opened by posting the three versions of EXO's new album logo. On July 10, the album's title was announced to be The War.

From July 9 to July 16, the album's track list was revealed one by one through a series of teaser videos each featuring one member. The album and its title track's music video were released on July 18.

SM started releasing teasers of the repackaged edition of the album with the message "The Power of Music". The first teaser titled #Total_Eclipse was released on August 21, 2017 at the same time as when the Solar eclipse of August 21, 2017 happened. The second teaser was released on August 28 titled #Parallel_Universe.

The third teaser titled "Power #RF_05" was released on August 30. On the same day, the title of the re-packaged album was revealed to be The War: The Power of Music and that it will be released on September 5, 2017 with 12 tracks including the title track "Power". SM started releasing teaser images of each member from August 30. On August 31, it was revealed that the album will include new three songs "Power", "Sweet Lies", and "Boomerang", along with the original nine songs of The War. On September 4, a poster of the repackaged album and "Power" music video teaser were released. The repackaged album and its three new tracks were released on September 5.

...
Wikipedia