Journey Through the Decade

"Journey Through the Decade"
The cover of the standard CD release featuring Gackt in the foreground
Single by Gackt
Released	March 25, 2009
Format	DVD single CD single CD maxi single
Genre	Alternative rock, symphonic rock, techno
Length	4:36
Label	Avex Mode
Writer(s)	Shoko Fujibayashi (lyricist) Ryo (composer, arranger) Kōtarō Nakagawa (arranger)
Gackt singles chronology
"Ghost" (2009) "Journey Through the Decade" (2009) "Koakuma Heaven" (2009)
Kamen Rider Series theme song chronology "Break the Chain" (2008) "Journey Through the Decade" (2009) "The Next Decade" (2009) Alternative cover The cover of the CD+DVD combo pack featuring Kamen Rider Decade in the foreground

"Journey Through the Decade" (stylized "Journey through the Decade") is a song by Japanese pop singer Gackt, serving as his thirtieth single released on March 25, 2009. It is his first song performed for Kamen Rider Decade, used as the television series' theme song.

It was used as the opening theme song for the 2009 Kamen Rider Series Kamen Rider Decade. It was released as a single CD and as a CD coupled with a DVD with the music video. The theme of "Journey Through the Decade" is that it describes the "Journey" (旅, Tabi^?).

The music video of "Journey Through the Decade" was later released in Stay the Ride Alive, "special memorial single" version which is a Digipak with a special cover, a third disc and a booklet describing Gackt's collaboration with the Kamen Rider Decade production.

On its first day of release, it sold 15,000 copies and reached #2 on the Oricon Daily Charts. By the release of its follow up single "The Next Decade", "Journey Through the Decade" had sold 94,000 copies. It stayed 25 weeks on the music charts. In June 2009, the Recording Industry Association of Japan certified it as gold. In December 2012, it was certified as platinum for sales of over 200,000 copies.