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It Just Very Slightly Bugs Me.
I know that there are 13 or 14 different characters in the iDOLM@STER series, each with their own signature set of songs, as well as their group songs. And if you're playing the game, you can literally get them to sing any other characters' songs, I think. Still, I've noticed that the songs I like skew heavily toward certain characters.
Here's a rough list of the iM@S songs I like:
Kiramekirari (Sparkling Sparkle) (Yayoi)
THE IDOLM@STER (group)
i (group)
GO MY WAY!! (group [Yayoi/Twins])
READY!! (group)
CHANGE!!!! (group)
Jibun REST@RT (Rest@rt Yourself) (group)
Aoi Tori (Blue Bird) (Chihaya)
Yakusoku (Promise) (Chihaya/group)
Little Match Girl (Yukiho?)
Kosmos, Cosmos (Yukiho)
ALRIGHT* (Yukiho)
inferno (Chihaya)
Marionette no Kokoro (Heart of a Marionette) (Miki)
Kazahana (Windflower) (Takane)
Nemuri Hime (Sleeping Beauty) (Chihaya)
Hana (Flower) (Kotori)
relations (Miki)
Sayonara wo Arigatou (Thank You for the Goodbye) (Haruka)
Massagu (Directly?) (group [Azusa/Makoto])
Watashi-tachi wa Zutto... Deshou? (We're Forever...Right?) (group)
Mitsumete (Gazing?) (Yukiho and Takane)
TRIAL DANCE (Hibiki)
Chihaya (my favorite character) and Yukiho (one of my less-liked characters) are represented a lot, while the twins (also among my favorites) barely get any mention aside from being implied in group songs. Haruka (my second-favorite character) is little-represented too.
* This song really has an asterisk at the end of the name. Don't ask me why.
IJBM: The songs "i" and "THE IDOLM@STER" are annoying to search for.