Whatever happened to "Rated X"?
Pictured above is what the Motion Pictures Association of America, a.k.a. the MPAA, used to use for its rating system. It's at the bottom. The "X" rating. This is what used to be used before the introduction of NC-17.
The pedal effect a.k.a. the stomp box is something that's been around a long time, taken many different forms and utilized many different technologies. One of the latest are the new offerings from BOSS such as the Multi Overtone (pictured). It has two outputs so you can create one seriously cool-sounding stereo effect. Cool pedal to have. If you're wondering what the Multi Overtone does, it's probably the best "enhanced chorus" you could ever have. You can detune just ever-so slightly, mix and match how much direct vs. how much effect is heard, and when using two amps... wow. It may not look like much, but it's an amazing effect. It would even work wonders just plugged into a mixer using two channels.
As far as I know, there is no popular music genre that ever truly dies. For any genre you can think of, there are fans of it even if it's not the popular music of the moment.