In 1995, she began her musical activities with RYO forming a unit initially called P・O・R, debuting with their mini-album RISE on the same year. The name was later changed to POR in 2001. MOMO was in charge of vocals, lyrics, keyboard, composition, arrangement and programming, while RYO was in charge of playing drums, bass, guitar, as well as mixing and mastering.

Their last release was the album Kono Yubi Tomare, in 2006. The group then officially suspended its activities in 2009, with an extensive discography, having so far recorded more than 80 original songs in about 12 discs, among singles and albums.

MOMO joined I've Sound in 2001, debuting on the I've x POR collaboration album G-Mix with the remix of uneasy. Two days later of that release, she also debuted with her first original I've song Velocity of sound, one of her most famous, along with philosophy, DROWNING, GREEDY and D-THREAD. After appearing on several compilations and recording a bunch of game songs, MOMO departed from I've in 2006 to focus on her own musical activities.

After POR disbanded, MOMO started her solo activities under her real name, Hitomi Momoi, with the mixed kanji/hiragana notation 桃井ひとみ. In 2009, she released her first single Yuudachi, in collaboration with Atsuhiko Nakatsubo label TTB studio, later also providing vocals for the song Wonderful Days.

In 2011, she launched her own label called FrogTrack Records, active since then. While her artistic name remains as Hitomi Momoi, on the same year she changed the name notation to モモイヒトミ, in full katakana. MOMO released many discs limited to live performances, with some of their tracks getting included on her Kaeru no Uta album series. While producing new tracks, she also rearranged several of her songs from POR discography and re-released them under her brand new solo career.

SPLIT SINGLES

2002 ・ philosophy

2005 ・ Velocity of sound

I'VE COMPILATIONS

2001 ・ G-Mix

2002 ・ Disintegration

2003 ・ LAMENT

2003 ・ OUT FLOW

2003 ・ ANIM Music Disc

2004 ・ Mixed Up

2005 ・ COLLECTIVE

2007 ・ I've MANIA Tracks Vol. I

2009 ・ I've MANIA Tracks Vol. II

2010 ・ EXTRACT

2010 ・ I've MANIA Tracks Vol. III

2012 ・ G.C.BEST

2014 ・ master groove circle NIJIIRO

2015 ・ The Time ～12 Colors～

2017 ・ I've C-VOX 2000-2014

2019 ・ I've groove DJ mix feat MOGRA

2021 ・ I've 20th Anniversary E-VOX

I'VE in OTHER COMPILATIONS

2005 ・ ANIM Vocal Collection

2014 ・ etude 10th anniversary edition

I'VE SOUNDTRACKS

2001 ・ Sonic Princess OST

NON-I'VE COMPILATIONS

2004 ・ Spotlight Kid 01

as I've Special Unit

2003 ・ I've PV Collection Vol. 03

2005 ・ Fair Heaven

2007 ・ I've MANIA Tracks Vol. I

2012 ・ G.C.BEST

2015 ・ See You ～Chiisana Eien～

2017 ・ I've C-VOX 2000-2014

SINGLES

2000 ・ Christmas☆Chef

2002 ・ soup

2003 ・ Motto Motto

REMIX SINGLE

???? ・ POpRa'q

ALBUMS

2000 ・ Kamihanki

2001 ・ Shimohanki

2003 ・ CYCLE

2004 ・ Thalys

2006 ・ Kono Yubi Tomare

MINI-ALBUMS

1995 ・ RISE

1997 ・ Yuuenchi

2004 ・ Kotodama Sakiwau Uta

BEST ALBUM

2001 ・ orgel

I'VE COMPILATIONS

2001 ・ G-Mix

2004 ・ Mixed Up (arrangement)