Board Thread:Questions and Answers/@comment-175.139.91.75-20130216030327/@comment-917693-20130216032145

o.o

well i doubt anyone can list all utaite whi had their original songs, but i can list some i know (totally incomplete though):
 * Yuikonnu
 * Shoohey
 * Sekihan
 * Soraru
 * Chomaiyo
 * Tightson & Alilem
 * RootFive (√5)
 * 96Neko
 * nano
 * Wotamin
 * Hanatan
 * Yamai
 * Mi-chan
 * Touyu
 * Luschka
 * Tourai
 * Usa
 * Guriri
 * Piko
 * clear
 * ＿＿
 * Ryo-kun
 * Machigerita
 * neko
 * Shuiro
 * Dasoku
 * Nanou

uh and i bet still quite a lot. since some collaborate with producers (like Soraru), some also do their own original song (like ＿＿) and some do originals in their doujin circle (like Yuikonnu).

And also i guess when a new album is released it's very likely to feature an original song.

actually the original songs are marked on the wiki either with a "(Original)"-tag or in an separate list