^The song titles and credits are out! And covers too!
For G.C BEST:
Blaze a trail, lyrics and vocals by Mami Kawada, composition from Kazuya Takase and arrangement by good ol' TakaNakaZaki combo. If nothing else, I expect a great arrangement for this song because Mami and TakaNakaZaki have always turned out gold (for all of their two songs together, but still, those were great).
For Omaira BEST:
Sig-naL ～0時過ぎのSpace soldier～, lyrics from Airi Kirishima, composition by C.G Mix, arrangement by C.G Mix and Takeshi Ozaki (who have teamed up for at least LSP's Trip - innocent of D- before) and vocals will be handled by a "new denpa unit", Pixy Lab. (The dot is actually a part of their name.) Rumors run wild as to who form Pixy Lab. Personally, I support the theory that it's Kaorin and someone from LSP. After all, what would I've denpa be without KOTOKO AND Kaorin? If not that, it could be nao. We'll see.
And for the record, I quite like the BEST albums' tracklists. On G.C BEST, pretty much everyone of importance in I've history is represented, from MOMO and SHIHO to even Lia. Although they could cut some KOTOKO songs and give a better example of MELL's stuff and Eiko and Kaorin probably could also use another song. I'm also happy both of the I've Special Unit songs are included, they're great!
Omaira BEST is also nice, nothing too surprising. I just wish Hoshizora Interceptor had also made it to the list. I'd gladly drop Maple Syrup or Seishun Rocket to have it included.
Also, Eiko had her concert and dropped her single for the expecting fans. The song WAS uploaded on youtube but it was made private, like, two minutes ago, I was just looping the song before that. T_T I'll post a link once the song resurfaces. For now, you'll just have to take my word for it when I say it was a fantastic song.