I just found something INDESCRIBABLY AWESOME.【ニコニコ動画】hide 未発表曲「コギャル」Tribal Ja,zoo 1998 11 8 ZEPP Sapporo
It's a performance of a song that was supposed to be on JA, ZOO! O_O Apparently it wasn't included because they didn't have a vocal track yet. D=
You might have to register to watch it, and the site's in Japanese, so I had to use Google Translator to figure some things out but OMG SO WORTH IT.
Oh, and if anyone can help me translate the lyrics I'LL LOVE YOU FOREVER. <333333
(Crossposting liek whoa. EVERYONE MUST SEE THIS.)
Edit: Found it on Youtube