One of the things we talk about in the SSPX is modernism. Particularly with new concepts that were introduced at V2. But how far should we go when we concern ourselves with modernism? Is it "too modern" to listen to rock and roll? Perhaps driving an automobile is modernism. After all, it wasn't until recently that automobiles were introduced to the world.
My take is that as long as there is nothing sinful about your actions and choices then it should be morally acceptable.
When it comes to modernism, we should really only concern ourselves with newer practices that were introduced to Catholicism in the later days. Particularly with those that are seemingly contradictory to traditional practices. Not so much with what we wear, what we listen to, etc. Although what we wear does matter, as long as it is not sinful it is acceptable. Am I right? Same with music?
InfiniteFaith, MaterDominici gave you some really excellent advice, read Padendi Dominici Gregis by St. Pius X. Read what modernism is and the causes of it. Forums can be excellent for this type of advice. Please though don't validate rock and roll, what you wear, or perhaps any other worldly influence, including television, by the answer of one poster vs. another or your perception of what you think others tell you. Get rid of any bad influence around you that can cause you to sin. Since you asked it, get rid of your tv if you have one, rock music, any music that glorifies sin filled behavior or makes you think of it.
In Pacendi, you will read two causes for modernism, curiosity and pride. Today's circuмstances change, technology changes and with it bringing new ways for evil to enter our soul. Some are old, such as bad reading, some are new such as tv, bad movies, videos, etc. Curiosity and pride.