[request] some song writing credits

[jani_kun]

Hi everyone! ^^

I'm organizing a list of all of Merry's songs with information regarding the credits of each song but there are a few I just couldn't find for the life of me! XD

So if anyone has any information on who wrote the music in:

R-246,
ニヒリスティック (Nihilistic),
M.E.R.R.Y. MARCH～デンヱンカウキヤウクミキヨク～,
歌声喫茶『モダン』 (Utagoe kissa [Modern]),
ルルルラララ (Lululu lalala),
コックドール・ママ (Coq d’or Mama),
sweet powder,
ひらひらとんでる。(Hirahira tonderu.),
ポエジー (Poesy),
ト・ロ・ケ・テ・ル (To ro ke te ru),
Midnight Shangrila,
montage,
アイデンティティー (Identity),
stupid x cupid

then pretty please, can you tell me? :)

EDIT: Thank you jiheishou for the answers!!