As some people already know, I'm a pretty big Kishida Kyoudan & The Akeboshi Rockets fan, so I was a bit surprised when I came across...
LiSA - 永遠 (Eien)
...and found Kishida himself providing the instrumentals for the song! (Now stuck on repeat...)
Found it even more surprising that it is available on iTunes (but not on the Japanese store, perhaps because Aniplex is owned by Sony, and you won't find Sony-published music on the Japanese iTunes?). I wonder if Kishida showed up at AX2012?