juicy: i suppose since you like KAT-TUN, i'll recommend some songs similar to theirs? i'd recommend Jidai, A-RA-SHI, A Day in Our Life, Kitto Daijoubu (this song is crazy, but catchy!), & truth for starters. my favorite album is ARASHIC.
their latest single, Believe, is quite good also. the other A-side isn't my cup of tea though.
but they are a pop-group music-wise, jsyk.