I Don't Know (Mika Nakashima song)

"I Don't Know"
Single by Mika Nakashima
from the album Voice
A-side	I Don't Know
B-side	Shut Up
Released	July 23, 2008
Format	CD, CD+DVD
Genre	J-pop
Label	Sony
Mika Nakashima singles chronology
Sakura: Hanagasumi (2008) I Don't Know (2008) Orion (2008)

"I Don't Know" is Mika Nakashima's 26th single, released on July 23, 2008. It is a collaboration with owarai group Morisanchuu (森三中), released under the name Mica 3 Chu (Mikasanchuu), and is her first single to be released as a CD+DVD format in addition to the regular CD only format.

'I Don't Know' is Mika's first English-language single. 'I Don't Know' and its B-side, 'Shut Up,' are sung entirely in English.

Track listing

All lyrics written by Mika Nakashima & Lori Fine, all music composed by Lori Fine, arranged by Coldfeet.

CD
No.	Title	Length
1.	"I Don't Know"
2.	"Shut Up"
3.	"I Don't Know" (Instrumental)
4.	"Shut Up" (Instrumental)

Charts

Oricon sales chart (Japan)

Release	Chart	Peak Position	Sales Total	Chart Run
July 23, 2008	Oricon Daily Singles Chart	6	17,708	5 weeks
	Oricon Weekly Singles Chart	11
	Oricon Monthly Singles Chart	—
	Oricon Yearly Singles Chart	392

External links

• http://www.mikanakashima.com/
• http://www.kumonoito.net/