I love discussing that, keep this thread alive until the new one then
If you ask about my favorite song, it's really hard for me to choose, I even can't decide.
I guess I go with
Hikari no Senritsu for most favorite song, because simply it's really different from any other Kajiura works. I've been a fan of Kajiura since 2002, so listening to Kalafina is really fresh and enjoyable.
Maybe the rest are...
red moon, sprinter, ARIA, oblivious, Yami no Uta, love come down, Magia, and so on.
Basically I love their A-sides, but I think I don't really like progressive, storia, and Lacrimosa that much.
Perfect B-side is snow falling, no doubt about it.
Most of their B-sides is great as well, lirica, serenato, sapphire, utsukushisa, Gloria, adore...
If Kalafina music made you feel like walking in a fairytale, then I think Kajiura is succeeded with this group, because it's her goal from the beginning