What "WWW" is though is cohesive, mainly because it really is just straightforward pop/rock. And really, I'd rather be given a simple album whose confidence in its identity shows in the material itself than one that's confused because it's trying to be "diverse" or "different." It's not pretentious, thank heavens. Jaejoong has clearly learned from "I" and "Y", albums whose existences I now want to deny. While this cohesion does get a bit too much later in to the album (I'll get to that later), clearly the thought put into the album was properly translated into the material, because it shows in the songs. Probably the most striking improvement on "WWW" is the production, which is about time. The album sounds very sharp, very trendy, and very clean -- strong production will do that.
The melody is smooth and sing-able, there is actual singing, something a lot of people forget when they try to do "rock." The melody isn't something that's possible only in a recording studio -- it's something ordinary people can sing or hum along to. On the surface the melody really is pretty, graceful in all the right places, forceful when it has to be. It's a great fit for Jaejoong's vocals as well, because he sounds best in higher registers that require him to belt out the notes. But at the same time he's a proficient enough singer that he doesn't just scream his way through the song.
Lastly, the transitions on "Just Another Girl" are, surprisingly, ridiculously smooth. The transition from the first verse to the first chorus is very clear, you know exactly when the chorus hits, but instead of the song bombarding you with "THIS IS THE CHORUS", it kind of just leads you to the chorus. It's a slow, but very sure build-up that starts the minute the first guitar comes in -- it knows exactly where it came from, and exactly where it's going. And I credit the arrangement of the drum line for that, because the drums really do anchor the song. There are quiet moments, there are very loud ones, there are breakdowns and explosions left and right, yes, but the song gets from one side to the other in the most natural way. It's like when you go on a tour and the tour guide knows exactly where to go and what to say when. The song knows exactly what it's doing, and it can do it very comfortably -- that mastery translates into the fact that "Just Another Girl" progresses with almost nonchalant smoothness.
"Just Another Girl" is trendy, very "now", yes, but also potentially timeless, simply because it's such a well-done song. It's "musical," because it went beyond just well-thought through and masterfully executed everything. If "Just Another Girl" is anything to go by, which it is, "WWW" is definitely a much, much stronger release from Jaejoong.