According to the official blog, the theme song of "Bakemonogatari" is produced by a music artists group supercell. The title is "Kimi no Shiranai Monogatari" and the single CD will be released on August 12th. Gazelle, a popular singer in Niconico Douga, sings the song instead of Hatsune Miku.
supercell was initially an amateur creator group, which uploaded VOCALOID Hatsune Miku songs to Niconico Douga.
That's pretty interesting, I've been looking forward to this anime for a few months now. Sampling a few of her songs, Gazelle seems pretty good and seems to be a pretty popular singer on niconico anyways.
That's why it sounded familiar to me... I was right when I thought that it sounded as if was a Miku song. Bakemonogatari is assured of a huge fanbase and not only because of the amazing animation of Shaft...