New to KAT-TUN ??

So i really really really liked the song Kizuna by kamenashi kazuya so i searched him up and found out about KAT-TUN. What are some good songs by them?? I'm basically new to J-pop in general, so any other songs or bands you recommend?? i've always knew about j-pop but i never really wanted to give it a try until I heard Kizuna ^^