I do not speak Japanese, so any opinions I have on songs will be based on other's translations and/or the music itself, disregarding the lyrics. My favourite of their albums, 21st Century fantastically shows the feeling of a new millenium. As a whole, the album strikes a nice balance between a more futuristic sound and the traditional one heard in previous albums, complete with some fun synth, frantic guitars, and Kyouka's characteristic screams. The opening track, Kouhai (World Wide Waste), begins with some classical string music, before transitioning into the main riff with some background flutes. It's a slow, ominous start, preparing the listener for what's to come. The next track, B.I.S (Balmy Illegal Society) is one of my favourites off of the album. It's a classic Aliene piece, with all the trademarks of their style mixed with an almost industrial sound, fitting the futuristic theme of the album. Mast's guitar work reminds me of some sort of machine... chugging along non-stop. The vocals are seamlessly integrated into the music, the screams reminding me of the scraping of metal. Black Jack Age is next on the album. It has a fun bass line opening the song, then the guitar and drums start to kick in. There isn't much to say about this one, but the frantic pace is fun, especially when it's briefly interrupted, before resuming at full force. It's like being in a washing machine. Kourin is another fun track, it's hard to put into words how it works, but it just has an.. immense energy. Up next is Native Devil, another favourite. The track has frantic guitars, industrial bass, and fantastic vocals - although that could be said about most tracks off of the album. It's one of the reasons this album works best listened to as a whole. It's a harrowing experience, but highly reccomended. Then we have Divine the Future from the Stars. Incredible. It's just immense. I love the processing on the vocals. It's frantic and gritty. The spoken parts add an almost chant-like quality. Combined with the repetition, the track is almost religious in quality. There isn't much to say about Seven Deadly Sins that hasn't been said before, so we'll skip to Under the Rose Leaf. This one is a bit different from the others, changing up the pace on the album. The song speaks for itself, but the almost industrial instrumentals are wonderful, returning to the machine-like sounds of the previous songs. The song embodies the rapid changes in technology around the time. On a similar note, the next song, Cyber Patrol Wo Uchiotose, expands on the the sounds and themes of the albums. It's very much an embodiment of 2000s futurism, which ironically serves to date it quite a bit. Chou is the last song on the album, and definitely sticks out musically from the rest. It's more melodic in nature, reminiscent of the main soumds of v-kei in this era, while not losing the signature touches of Aliene, most notably the vocal processing. Overall, it's a solid album, and an interesting look at the progression of the band's music, which you can hear echoes of in members later projects, ex. Insanity Injection.