Westkana
HA! I live in her CLOSET!
@Atlas Star You're forgetting Yami no Uta (though that arguably doesn't have a refrain).
My theory on why Kajiura doesn't write many lead parts for Keiko is because she can't write harmonies to her. At the range where she sounds the best (her low range), Wakana & Hikaru can't sing low enough to give enough support for it, especially with how much bass Keiko's voice has. As for high harmonies, I feel like they overpower her, especially with Hikaru. I may be alone on this, but I feel like I can hardly hear Keiko on Ongaku's chorus in lives because Hikaru is overpowering her. Same goes for Usumurasaki's bridge and Te to te's refrain. And Wakana in Kizuato and identify's verses aren't much better either, even though her voice is lighter than Hikaru's. Since Kajiura can't write good harmonies for Keiko, she opts not to write lead parts for her. Also, the aforementioned bass in her voice allows her to support Hikaru & Wakana well.
As for why we keep getting Wakana-lead songs over and over, I think it's simply because Kajiura loves Wakana's tragic voice.
My theory on why Kajiura doesn't write many lead parts for Keiko is because she can't write harmonies to her. At the range where she sounds the best (her low range), Wakana & Hikaru can't sing low enough to give enough support for it, especially with how much bass Keiko's voice has. As for high harmonies, I feel like they overpower her, especially with Hikaru. I may be alone on this, but I feel like I can hardly hear Keiko on Ongaku's chorus in lives because Hikaru is overpowering her. Same goes for Usumurasaki's bridge and Te to te's refrain. And Wakana in Kizuato and identify's verses aren't much better either, even though her voice is lighter than Hikaru's. Since Kajiura can't write good harmonies for Keiko, she opts not to write lead parts for her. Also, the aforementioned bass in her voice allows her to support Hikaru & Wakana well.
As for why we keep getting Wakana-lead songs over and over, I think it's simply because Kajiura loves Wakana's tragic voice.