ya, but the rest of the songs aren't in the same style as that (they're more bubblegum).
For Asian Kung-Fu Generation I recommend Houkai Amplifier (it's got the naruto song on it they do) but it's a shorter album. Rewrite is on Sol-Fa.
Chara's not bubblegum, when I was there they called her the Japanese Alantis morriset, which is about as accurate as calling me the white Michael Jordan, because of the theme of the album. But she's part of what I guess you could call the "Girl Power" movement over there with Misha and a few others, kind of a "we actually have talent and can sing" group that stand out because they're not generic J-pop.
L'Arc is really hit or miss for me, they keep wavering back and forth from Bubblegum to actually good music (ie rock) and they'll have one or two songs that are along those lines and then a bunch that are almost there but they then they chicken out and go back to the sap that's not very good. Ray is a good "Best of Album" they release in '99, smile which is the one everyone knows the from (FMA song is on that one, and you can actually buy a localized version at FYE) is ok but it follows the above trend I mentioned above.
Never heard Adingdon Boys School, though I really don't follow the Japanese music charts much at all, considering how hard it is to get over here and how easy it is to get burned by really, really bad music (especially at $30 a cd) I'm very cautious before getting anything. Much like I am with Anime, 98% of everything made sucks and sometimes it's just not worth the time trying to weed out the good things. Of course if you can't buy it here in the US via normal means (ie not import or ebay) I tend to just download, if they don't want to let me buy their music (the music labels) without jumping through hoops and paying twice as much as normal (which the labels don't see any of that extra money) then I'm not going to buy it. Plus most of this stuff isn't licensed in the US.