the band "19"

[Hazuki]

I found it on Wiki for you~ Just a few lines though

19 was a Japanese popular music duo. Its members were Kenji and Keigo. The group broke up in March 2002. Kenji is now a member of the band 3B LAB.☆.

http://en.wikipedia.org/wiki/19_(band)

3B LAB.☆.

3B Lab (3B Lab, surī bī labo?), often stylized "3B LAB.☆", "3B Lab.Star", or "3B Lab.s", is a Japanese popular music group. Its members are Okahira Kenji who previously was in 19, Chiba Takatoshi who provided musics for Kawahara Ayako, and Tamakoshi Masahiro.

http://en.wikipedia.org/wiki/3B_LAB.%E2%98%86

Hope this helps~! Too bad there isn't many information on them though.