Template:This Day in History April 17


 * 2002 - Iroppoi Onna ~SEXY BABY~ releases. (Country Musume ni Ishikawa Rika (Morning Musume) single)
 * 2005 - Yaguchi Mari resigns from Morning Musume.
 * 2011 - SI☆NA disbands.
 * 2013 - Brainstorming / Kimi Sae Ireba Nani mo Iranai releases. (Morning Musume single)