I'm not going to exert much energy defending Monotonous Snare Music, um I mean drum n bass. "IDM" is such a vague tag these days that it is essentially meaningless, but I occasionally find releases lumped in the genre that I like. Certainly, there were a lot of "IDM" artists in the 90s I liked then and continue to respect. As for ambient, from John Cage to Philip Glass to Pete Namlook to All India fricken Radio, all I can say is "O RLY" through about 3 miles of reverb.