"Together When..." is a song recorded by Japanese recording artist Ayumi Hamasaki. It was released by Avex Trax on December 5, 2007, and Rhythm Republic on April 9, 2008 as a double A-side with one of Hamasaki's tracks "Game" as the third and final single from her ninth studio album, Guilty (2007). It was released as Hamasaki's first digital single in Japan, and was Avex Trax's first single to be distributed as a digital download only. The track was written by Hamasaki herself, while production was handled by long-time collaborator Max Matsuura. Musically, "Together When..." is a power ballad. The lyrical content is about the finishing and separation of a relationship between lovers.

Upon its release, "Together When..." received positive reviews from most music critics. Some of them selected the track as the best song from the album, while complimenting the composition and Hamasaki's vocals/songwriting. Although it did not enter in Japan's Oricon Singles Chart, it did peak at number one on the Reco-kyō Singles Chart. It was certified in two categories by the Recording Industry Association of Japan (RIAJ); as of June 2016, it has been downloaded over three million times, making this Hamasaki's highest selling single. An accompanying music video was directed by Takahide Ishii, which displays Hamasaki waiting at a taxi stand, and another scene with her as a marionette. To promote the single, it was included on some of Hamasaki's concert tours including her 2007 and 2010 New Years countdown shows.

"Together When..." was written by Hamasaki herself, while production was handled by long-time collaborator Max Matsuura. The song's instrumentation consists of piano and guitar by musician CMJK, drums by Makoto Izumitani, bass by Chris Chaney, conducting by David Campbell, and string arrangements by the David Campbell Strings Ensemble. It was then composed together and arranged by Kunio Tago and CMJK. "Together When..." was one of the only tracks on Hamasaki's ninth studio album, Guilty (2008), that included instrumentation by Caucasian composers, instead of musicians in Japan. Musically, "Together When..." is a power ballad. Bradley Stern from MuuMuse compared the composition and musical elements to the material from Hamasaki's 2002 album I Am..., and her 2003 EP Memorial Address. According to a staff reviewer at Japanese music magazine CD Journal, the song includes "quiet piano" riffs and "elegant string" arrangements. The lyrical content is about the finishing and separation of a relationship between lovers.

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