I hear your points, and I am in
agreement with some of them, and have thoughts about others.
Wakana's angelic, haunting, melancholic voice and Keiko's incredible lower harmony.
This is undeniable. They have those unique vocal qualities and expressive abilities and have demonstrated them again and again, most successfully, in my opinion, to Kajiura's music.
I did go back and listen to her pre-KnK songs (FJ Yuuka and See Saw and the some of the OSTs) and while there are sprinklings of it in a few places, I'd argue Kajiura's now signature harmony writing didn't really come together until 2007 with Kara no Kyoukai and Kalafina forming as a result. At least, the very promiment lower harmonies, which you have to credit Keiko for bringing it to life as well with her incredible execution, wasn't at all synonymous with Kajiura's brand until KnK and Kalafina (and later with FictionJunction and her FJ lives as well). If Kajiura wrote the recipe, it's her vocalists and musicians that bake the damn cake. It's the same thing I see when people argue about writers vs actors - an actor needs good lines just as much as a director and writer needs a good actor, and neither can be easily replaced once you find that rapport and synergy.
I will always highlight and emphasize the overall impact and creative spark of
Kajiura as composer, lyricist, and arranger. When we look at her background, the fact that she grew up listening to mostly German (and other European) operas A LOT, together with classical and choral music, is the reason why she writes her group vocals primarily in that polyphonic style (and thus REQUIRES classical style singers in a lot of her music, or for her singers to adopt classical stylings for example in
Kajiurago). No singer could inspire a composer that did
not have that classical background to write the way Kajiura writes. It just can't happen, no matter how special their voice might be.
I have heard all the Kalafina ladies say in different videos that they initially
struggled to adapt to Kajiura's musical requirements at the beginning because it was very different from what they were used to doing, and so she essentially took them into unexplored realms. We know Keiko was singing in a rock duo, and I'm pretty sure she wasn't doing long, legato low notes back then (maybe even struggling with her vocal identity as a contralto, as many of them do, trying to sing high to avoid having limited acceptance). It was Kajiura that pushed her into embracing (and having the chance to sing a lot in) her low range, and gave it a fundamental space in her permanently harmony-based group vocal arrangement, which we are all grateful for. Keiko had the voice naturally, but probably not the confidence or prolonged exposure to music that required that singing style to have explored them for herself, prior to working with Kajiura.
Kajiura has been going through phases in her career. She started primarily with the pop/rock band explorations, electronic work, and bits of classical with her compositions including with See-Saw because she also grew up with the Beatles and other Japanese and Western pop music, and she could explore those sounds starting with the band at school, singing basic harmonies with Chiaki who was projected as a powerful lead voice as happens in rock/pop, and this has also evolved over time into her work on Kalafina/FJ with FBM. Imagine if she had been at a conservatory like Yoko Kanno and studied classical music, we may have had a very different creative style from Kajiura.
With FJ Yuuka, she went more for the softly dramatic ballad stylings (which she continued with Wakana in Kalafina and FictionJunction), while simultaneously still doing pop, instrumental, and classical stuff (with Yuriko, Hanae, Remi, and so on). Of course before that after See-saw's breakup she explored with other singers like Emily, Deb, etc., doing electronic, ballad, classical and the band elements (with lots of strings!)
The story, plot, and themes of
Kara no Kyoukai are what inspired Kajiura to write what she wrote for that show, as she then looked for singers who could bring out that feeling and apportioned the songs to them. Speaking of "Oblivious", the first thing we hear is
Hikaru's kajiurago, then
Keiko's kajiurago line, then
Hanae Tomaru's voice singing the haunting refrain (which is repeated multiple times in the song), before Wakana come in with the verse. I am sure Hanae's part is an emotional refrain in the song; Hikaru also sings it later on (while it plays in the background).
Let's also not forget that
Kajiura hears everything in her mind before writing it down. She is not co-creating the melodies in the studio with any of the ladies. She hears the main melody and develops it over time, adding layers and development. She hears the vocal parts and suitable vocal tones/colors and writes for them in specific ways (not the standard chords, sometimes extended chords or transposed), which is why she oftentimes required Yuriko to mirror Keiko, often singing the same thing as Keiko at the same time an octave apart). The ladies may suggest some tempo or other dynamics with the instrumentalists (as we've seen in rehearsal videos) but they don't change what was composed.
The singers don't create their melodies. They sing what is written by Kajiura on the music sheet and can of course interpret as they feel depending on their emotive evolution or musicality (that varies from singer to singer). If a singer rashly changes the melody on the page, it can clash with what the rest of the instrumentation is doing, so that still comes down to arrangement skill.
So, I am definitely not diminishing the qualities of Hikaru, Keiko, or Wakana, as singers and performers. The group is what it was vocally and visually because of their voices, personalities and vocal/stage performances, but the songs, music styles,
name of the group, and the stories told exist because Kajiura created them (as her interpretation of the anime stories she read) and the FBM played them they way they did.
I rarely hear FBM get their props really in the fandom, case in point was I saw Kalafina fans on other blogs saying the Kalafina anniversary band was better, even when it was obvious that the removal of Korenaga's signature solos in some songs and Akagi Rie's sonorous flute accompaniment was a glaring miss. They are sometimes described as if they're just replaceable session musicians which diminishes the impact of their absence, but that's another topic for another day.
Truth be told,
the only vocalists that have worked with Kajiura that I can really praise as having strong creative melodic chops (and so could currently have had a back-and-forth with Kajiura if they were in a collaborative melodic writing sessions), are (i) CHIAKI ISHIKAWA, who though started with just singing Kajiura's music, has gone on to write and perform many, complex vocal melodies and harmonies in her own solo work, and written powerhouse songs for other artists, e.g. JUNNA, and let's not forget (ii) KOKIA, who is also a respected composer herself (also having classical/opera background) and writes really unique melodies and complex harmonies. In fact, KOKIA's songs from Kajiura are often tame in complexity compared to her own work. I hope Kajiura writes something epic for KOKIA's mature vocal sensibilities, soon.
They've shown the ability to do it all the most from every singer I've seen work with Kajiura.