Ayumi - Her tours are visually wonderful to hear, always uniquely costumes, and you can really hear her efforts. She sings old songs because people like them, and it's a way to interact with fans. I mean, why is Sakuranbo and Katomial Dial always in Otsuka Ai's concerts? Same reason.
Otsuka Ai - Her combined talents at playing instruments with singing = <3
Namie - just because.
