Artists like Aikawa Nanase, Tomoko Kawase (the brilliant green) and hitomi all write their own lyrics
Cool ne?...if i'm not mistaken Tomiko Van, Kaori Mochida and Utada Hikaru also write their own lyrics as well.....(sometimes there might be a few exceptions to a few songs of these artists I mentioned but comparing to the huge work these artists do it's not unnatural that they might cover one or two songs).