from my experience the most popular singular music group among (pre-RonPaul2008/2012 campaign) anarcho-capitalists is metal, like Opeth is their "we'll ease you in from your radio friendly alternative rock" kind of metal
"shitty punk" is probably up there in the top three
i must need to update my worst holes of libertarianism so i can keep an eye on these kids, i'm sure resetera has a HANGOUT for them i can bookmark
also i like looking at the info boxes on wikipedia trying to explain music genres:
Stylistic origins
Hard house - newstyle - gabber - techno - industrial hard trance - New Beat
Cultural origins Late 1990s - early 2000s, Netherlands
Derivative forms
Early hardstyle - euphoric hardstyle - rawstyle - dubstyle - freestyle - jumpstyle - big room hardstyle [1] - hard drop
a derivative of hardstyle is early hardstyle

I think the emo page once said something like origins: "earlier emo", derivative forms: "later emo"
