I've been hooked since April 2006. My conversion (under the user name "Rockist Scientist") is documented on this ILM thread:
http://www.ilxor.com/ILX/ThreadSelec...threadid=39358
Preliminary investigation suggests she is the major pop music figure of this decade, but I've only been listening to her for--what?--a week, and then only to online files. But I'll be buying some CDs soon enough.
Anyway, milton parker had been talking about Adult on a different thread and it seemed interesting, which led me to check youtube, and after seeing Himitsu and Kurumaya-san and then solo videos like Ringo No Uta, Honnou, and Yami ni furu ame, I was very very interested in hearing and seeing more.