1999

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1999 was the year in which Fukuda Asuka graduated from Morning Musume and Hello! Project; Goto Maki joined Morning Musume; Taiyou to Ciscomoon, Coconuts Musume, Country Musume, and Melon Kinenbi were formed; Miyoshi Chinatsu joined Hello! Project; Yanagihara Hiromi died in a car crash; and Kobayashi Azusa left Country Musume and Hello! Project.

Members

• February 21: Taiyou to Ciscomoon is formed.
• March ?: Coconuts Musume is formed.
• April 1: Hello! becomes Hello! Project.
• April 18: Fukuda Asuka graduates Morning Musume and Hello! Project.
• April 27: Country Musume is formed.
• May 11: Miyoshi Chinatsu joins Hello! Project. 
• July 16: Yanagihara Hiromi dies in a car accident.
• August 10: Melon Kinenbi is formed.
• August 22: Goto Maki joins Morning Musume as the 3rd generation.
• August 23: Kobayashi Azusa leaves Country Musume and Hello! Project.
• October 3: Petitmoni is formed.

Birthdays

• January 14: Mogi Minami is born.
• February 15: Ogata Haruna is born.
• February 25: Ichioka Reina is born.
• March 4: Fujii Rio is born.
• March 12: Oda Sakura is born.
• March 14: Yokogawa Yumei is born.
• March 26: Aikawa Maho is born.
• May 7: Sato Masaki is born.
• May 31: Shimano Momoko is born.
• July 7: Kawamura Ayano is born.
• August 4: Hirose Ayaka is born.
• August 29: Mashiro Kana is born.
• September 22: Yoshihashi Kurumi is born.
• October 7: Nonaka Miki is born.
• October 20: Niinuma Kisora is born.
• October 24: Kamikokuryo Moe is born.
• October 27: Kudo Haruka is born.
• November 10: Tanabe Nanami is born.
• November 30: Kaga Kaede is born.
• December 11: Hirai Miyo is born.

Singles

Morning Musume's best-selling single LOVE Machine also ranked at #1 on Oricon for three consecutive weeks.

Petitmoni's debut single Chokotto LOVE was a #1 hit as well.

• February 10:
  • Memory Seishun no Hikari - Morning Musume
  • Anata no Yume ni Naritai - Heike Michiyo
• March 10: Motto - Tanpopo
• April 21: Tsuki to Taiyou - Taiyou to Ciscomoon (debut)
• May 12: Manatsu no Kousen - Morning Musume
• June 9: Junjou Koushinkyoku - Nakazawa Yuko
• June 16: Tanpopo (Single Version) - Tanpopo
• June 23: Gatamekira - Taiyou to Ciscomoon
• July 14: Furusato - Morning Musume
• July 23:
  • Halation Summer - Coconuts Musume (debut)
  • Futari no Hokkaido - Country Musume (debut)
• July 28:
  • scene - Heike Michiyo
  • Uchuu de La Ta Ta - Taiyou to Ciscomoon
• August 4 - Unchain My Heart - Miyoshi Chinatsu (debut)
• August 25:
  • Everyday Everywhere - Taiyou to Ciscomoon
  • DANCE & CHANCE - Coconuts Musume
• September 9 - LOVE Machine - Morning Musume
• September 29 - Magic of Love - Taiyou to Ciscomoon
• October 20 - Seinaru Kane ga Hibiku Yoru - Tanpopo
• November 10 - Love, Yes I do! - Miyoshi Chinatsu
• November 25 - Chokotto LOVE - Petitmoni (debut)
• November 30 - Yukigeshiki - Country Musume
• December 8 - Marui Taiyou -winter ver.- - Taiyou to Ciscomoon

Albums

Taiyou to Ciscomoon - Taiyo & Ciscomoon 1

• March 31: TANPOPO 1 - Tanpopo (debut)
• July 28: Second Morning - Morning Musume
• October 27: Taiyo & Ciscomoon 1 - Taiyou to Ciscomoon (debut)

Others

• January 28: Morning Musume's Major Debut 1st anniversary
• September 14: Morning Musume's Formation 2nd anniversary