Music is the language of the soul. If the music you listen to inspires you to turn to Hashem and be more inspired to grow in ruchniyus, then you are listening to something worthwhile. If the music you listen to depresses you, pulls your neshama down, and gives you a feeling that is not kosher, then you shouldn’t listen to it.
Many of the plays performed by Jewish women for tzedaka take a non Jewish play, change it to resemble something kosher and use many of the same tunes as the original score. (Annie, the Wizard of Oz, etc…) Women become very inspired by these performances and buy the cd’s for home use. If there is something wrong with this, don’t you think the rabbonim would be against this practice, which is going on for over thirty years?