Chronology:
(1993-03-21) Debut CD Single "Otome no Policy" relesead in Japan.
(1994-08-01) CD Single "Yasashisa no Tametebako" released in Japan.
(1994-10-01) CD Single "Tuxedo Mirage c/w Ai no Senshi" released in Japan.
(1995-06-21) CD Single "Choppiri Chef Kibun" released in Japan.
(1995-11-01) CD Single "Zukkoke Paradise" released in Japan.
(1998) Leaves Columbia Music Entertainment
(2000) Changes her name from 石田よう子 to 石田燿子
(2000) Enters Geneon (Formerly known as Pioneer LDC)
(2000-06-21) CD Single "Moonlight Densetsu c/w Otome no Policy" released in Japan.
(2000-09-22) CD Album "Ultra Anime Eurobeat Para Para Max" released in Japan.
(2000-11-24) CD Album "Ultra Anime Eurobeat Para Para Max 2" released in Japan.
(2001-01-25) CD Album "Ultra Anime Eurobeat Para Para Max 3" released in Japan.
(2001-05-25) CD Album "Ultra Anime Eurobeat Bishoujo Max" released in Japan.
(2001-06-08) CD Album "birth" (J.e.t.) released in Japan.
(2001-06-22) CD Album "Ultra Anime Eurobeat Para Para Max 4" released in Japan.
(2001-08-24) CD Album "Ultra Anime Eurobeat Mecha Max" released in Japan.
(2001-10-24) CD Maxi Single "Sugar Baby Love" released in Japan.
(2001-12-21) CD Album "Ultra Anime Eurobeat Para Para Max 5" released in Japan.
(2002-03-01) CD Album "Ultra Anime Eurobeat Best Max" released in Japan.
(2002-04-24) CD Maxi Single "Towa no Hana" released in Japan.
(2002-11-07) CD Maxi Single "Egao no Tensai" released in Japan.
(2003) CD Maxi Single "Aimai" (J.e.t.) released in Japan.
(2003-02-26) CD Sweets released in Japan.
(2003-02-26) CD Maxi Single "Shinjitsu no Tobira" released in Japan.
(2003-07) Sweets released in the U.S., featuring the bonus track "Sugar Baby Love (English Version)."
(2003-10) Starts appearing as assistant host for "Masami Okui no KISS3"
(2003-10-29) CD Maxi Single "Takaramono" released in Japan.
(2003-11-08) First tour "~Live Sweets!~" starts at Harajuku Astro Hall (Japan)
(2004) CD Maxi Single "Zou" (J.e.t.) released in Japan.
(2004-04-28) CD Maxi Single "metamorphose" released in Japan.
(2004-08-25) Anime/Eurobeat CD Hyper Yocomix released.
(2004-10) Leaves the radio show "Masami Okui no KISS3"
(2005) CD Maxi Single "Aisuru Hito" (J.e.t.) released in Japan.
(2005-01-26) CD Maxi Single "OPEN YOUR MIND ~Chiisana Hane Hirogete~" released in Japan.
(2005-03-29) CD Album "all of me" released in Japan.
(2005-05-03) CD Album "all of me" released in the U.S.
(2005-05-05) Second tour "all of me" starts at Banana Hall (Japan)
(2005-08-16) CD Album "Para Para MAX US Mix 1" released in the U.S.
(2005-10-11) CD Album "Para Para MAX US Mix 2" released in the U.S.
(2005-12-06) CD Album "Para Para MAX US Mix 3" released in the U.S.
(2006) CD Maxi Single "MOON" (J.e.t.) released in Japan.
(2006-02-08) CD Maxi Single "Aka no Seijaku" released in Japan.
(2006-04-28) CD Maxi Single "Shiawase no Iro" relesead in Japan.
(2006-05-02) DVD "Anime-Pop Star Yoko Ishida Live in Concert" released in the U.S
(2006-08-25) CD Album "Hyper Yocomix 2" relesead in Japan.
(2007-09-21) CD Album "Single Collection" released in Japan.
(2008-06-25) CD Album "Hyper Yocomix 3" released in Japan.
(2008-08-20) CD Maxi Single "STRIKE WITCHES" released in Japan.
(2008-08-26) CD Album "Single Collection" released in South Korea.
(2009-11-22) CD Album "Sign of us" (J.e.t.) released in Japan.