999+09

Slank's 999+09 is a double album unlike any other. Released on October 1st, 1999, it's divided into two distinct series: Blue and Black. Each series was initially released separately, with the Blue series featuring 13 tracks and the Black series containing 14, for a grand total of 27 songs. The album's chronology is written in a "Slank language" that can only be deciphered by purchasing both the Blue and Black series. It's like a musical puzzle waiting to be solved! Adding to the intrigue, the lyrics on the cover are designed to be accessed on Slank's official website, creating an interactive experience for fans.