Cool topic! I'm not very familiar with A9, so I can't really offer a critique on your fantasy tribute. =|
I'm a big fan of tearing down boundaries, taking risks, and being both creative and unpredictable when it comes to music, so my tribute would be very unorthodox! I think it would amazing to hear these bands and their different renditions: MY DIR EN GREY TRIBUTE ALBUM! 01: 激しさと、この胸の中で絡み付いた灼熱の闇 - kamomekamome "Hageshisa..." is a pretty intense song throughout and would suit a "thrashing-ly" hardcore band like kamomekamome. I could imagine them spicing up the riffage a bit, but maintaining the spirit of the song. They'd probably replace kyo's low-growls with screaming (but they're good at it, so... ;P) 02. CAGE - 9mm Parabellum Bullet The melodic and hooky nature of this song would be right up 9mm's alley. Not to mention they'd absolutely nail the upbeat instrumentation while managing to infuse their signature sound. 03. 逆上堪能ケロイドミルク - THE BACK HORN "Gyakujou Tannou Keloid Milk" has a signature high-note in it that Yamada WOULD NOT be able to hit. For some that would probably kill the song, but I think THE BACK HORN could put enough power behind the rest to make a compelling rendition. 04. Bottom of the death valley - LOSTAGE Lostage are fucking fantastic at covering songs AND "RED…[em]" has a great, straightfoward hard-rock sound that would cater to the band's strengths. Although since Takahisa doesn't really scream, their cover wouldn't be as dark as the original. Still tons of room for Takahisa's bass playing to shine, though. 05. Machiavellism - 八十八ヶ所巡礼 This song has such a sinister yet playful tone to it - 88kasyo could do wonders with this. My only concern would be the more melodic, singing parts since Margaret doesn't really "sing" per se. 06. 凌辱の雨 - me-al art I'm specifically referring to the funkier (and all around better) single version of "Ryoujoku no Ame". Imagining Satoko singing the chorus gives me chills. In fact, she'd completely obliterate Kyo on this song. The only real downfall is that Satoko probably can't do the screaming parts. 07. 悲劇は目蓋を下ろした優しき鬱 - THE NOVEMBERS Brooding, atmospheric numbers like "Higeki wa Mabuta..." are THE NOVEMBERS' specialty. In fact, I think their cover would be extremely faithful to the original. 08. raison detre - 凛として時雨 I know I wanted ling tosite to cover ONE of dir en grey's songs, but it was tough to chose one. Ling is an extremely peculiar band, so I think they'd rip a completely new asshole into whatever DEG song they cover. They'd probably change the drumming and speed it up a bit for sure. 09. INCONVENIENT IDEAL - イツエ
The chorus of this song is so incredibly powerful that you'd need an equally or even more emotive vocalist to sing it, but I think itsue's vocalist fits the bill. There are no screaming or harsh vocals in this song either, so she could definitely pull it off!
10. THE FINAL - cinema staff
Perhaps one of diru's most pop-oriented songs? What better band to cover this than cinema staff? A band that has both keen pop sensibilities and raw aggression!
OBVIOUSLY this is a highly-unlikely tribute, and my selection of DIR EN GREY songs is horribly biased (I'm just a casual fan, haha). Ardent fans of the band would be both disappointed in the tracklist AND the band selection, but I personally think it would turn out pretty cool!