Tsuukaku Zanryuu (If I cry) from the Kara no Kyoukai Ongakushu Album. All 17 minutes of it.
(That piano/ vocal part at the end never fails to move me to tears. )
Patrick Stump's Truant Wave EP. I listened to Cute Girls all day yesterday, not to mention that so many live/acoustic performances of Patrick's solo stuff are all over YouTube.
In terms of J pop I found really nice slowed down guitar acoustics of Alellulia, hikari no senritsu and Blaze which I've been loving.
into the world-Kalafina live (wow... just wow. It sounds like a studio version, I love all three girls in the song and I love it more than far on the water, it may be my favorite RHH song. There I said it. heh)
Ashita no Keshiki.
I only listened to it a few times ages ago when I got into Kalafina, and I was like "eeew, boooring", so kept ignoring it all this time, but yesterday I listened Seventh Heaven again and found it and now I think it's a damn masterpiece, the voices, the melody, the instruments, everything is perfect
Kalafina's Jingle Bells. It's so perfect, the vocals are just so so SO perfect. The strings are also really lovely too. I really hope Kaijura plays with acoustic vocals/ accapella in the future because that song scratches an itch I've had for awhile now. So good.