Just gave the two b-sides a listen, and I have to agree with those who mentioned that both b-side tracks sound very similar. It is my theory that Kajiura composed a tune, but could not decide whether or not to go down the melancholic ballad path (Mahiru) or the uplifting, rock-ish path (Samidare ga sugita koro ni). I think this arrangement of having two different paths being displayed on one single as two different b-sides was genius.
I love listening to different versions of one song with different emotional roots. The best that Kalafina has done this in is sprinter, the recorded version, and then sprinter ~acoustic version~. The studio recorded sprinter shouts the power of speed, whereas the acoustic version from the Christmas LIVE Special gave the song a very soft, nostalgic touch.
I'd love to think that the one b-side we are normally given to go along with the a-side (excluding "believe", where we got two b-side tracks) was divided up into two parallel tracks, both essentially carrying the same rhythmic and melodic roots, yet stemmed out to different styles and emotions brought out from within. It goes to show how versatile and dynamic music can be.
Now on to the individual tracks' critique:
2. Mahiru: So far, my opinion is that KEIKO's voice sounds very similar to the voice that she used in the opening for "far on the water". I have to applaud her for being able to be versatile in the sense that she is able to do songs like "Ongaku" and "signal", and then changing her voice to match what I believe to be a very 90's ballad feel. Just listening to her voice, and judging by the first line "sora no takami wo mitsumenagara anata no soba wo aruiteru", which by my years of Japanese translations via a Japanese dictionary and limited grammar studies tell me means something along the lines of "While looking high into the skies, I am walking by your side". , just gives me the warmth of "midday"; next to her, by her side, walking down a familiar path like young lovers. At the same time, the pangs of nostalgia are strong... I can tell this is going to be a tearjerker kind of song for me!
3. Samidare ga sugita koro ni: The song's title's meaning is completely reflected in the emotions depicted by the song. It has a very post-depression sort of feeling, as if the storm has passed and now we stand united and sing a song together, ahaha! This song, along with Mahiru, reminds me of the 90s. Kajiura surely was looking to experiment with old styles with these two b-side tracks. The electric guitar and the percussion are surely reminiscent of the styles from back in the days.
I never expected Kalafina to venture towards this type of music (90's throwback), but I am certainly and delightfully surprised. I cannot wait to listen to the entire tracks, which hopefully will be available very soon!