there's an Aqua Timez thread ->
http://www.ahsforum.com/forum/showthread.php?t=86569
I guess the closest you can describe their music will be pop/rock filled with inspirational lyrics written by the frontman lead singer Futoshi
they released their 4th album Carpe Diem just last Wed
I'm not a very hardcore fan of Aqua Timez but they have some great songs in their discography inclusive of Velonica (which's the 1st song I heard of them even though I kept on hearing ALONES being played quite often but I had no idea it's the same band haha)
some of my fave singles include
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Sen no Yoru wo Koete ; the theme song for the first BLEACH -Memories Of Nobody- movie & an amazing melody it has
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ALONES ; opening theme song for the BLEACH
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Niji ; used for the 2nd season of Gokusen & the acoustic of Niji is very pretty which's found in their 3rd album Utai Sarishi Hana
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Plumeria ~Hana Uta~ ; used to promote the Gokusen movie
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Ehagaki no Haru
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GRAVITY Ø
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Mayonaka no Orchestra ; their latest one to promote Naruto