Orisonata is a progressive metal project, a collaboration between Jason Lee Greenberg and his wife Jennifer Grassman, a classically trained vocalist.
Among their influences they cite many bands, but also Jules Verne and J.R.R. Tolkien. It is not surprising that the tracks on their self-titled album refer to works of fantasy ("The Once and Future King"), science-fiction ("Journey to the Center of the Earth"), religion ("The Great Baptism"), folklore ("Robin Hood") and myth ("The Muses").
Tracks are long - the shortest is 5:07 - and dramatic: big guitar, big voice, and big keyboards (another listed influence is Johann Sebastian Bach). This band is in the business of epic quests.
I do not think they are being pretentious, but I did feel it was a bit silly and overblown. I feel the same way about Trans-Siberian Orchestra, though, and they have a definite fan base. Fans of Dragonforce might also be interested.