"Week!"'s the ninth single of Do As Infinity, released in 2001. The B-side of this single, "Tsuredzure Naru Mama ni",'s the only studio-recorded song from guitarist Ryo Owatari, the lyrics were also written by him. The melody of this song parallels to the melody of the song "Yesterday & Today". Track listing "Week!" "Week!" (Instrumental) (Instrumental) Chart positions Chart (2001) Peakposition Time inchart Japan Oricon 8 6 weeks… (More on Week)