I've started to think that it's not normal to listen to stimulating music for hours. For instance my dad is an high-stress individual and he plays music in his car and home "24/7". I find it annoying and mildly stressing. When we are teenagers, our hormones are often imbalanced (peaks of estrogen, prolactin and growth hormone) and many of us are at least mildly neurotic. We listen to a lot of music. When you are young you are also more attracted to adrenaline rushes like watching scary movies and riding roller coasters. As the system supports it less with age you draw away from excessive stimulation, in some cases, even when not particularly susceptible to stress you simply change what you want from life. I see silence as a sort of equalizer, a bringer of internal balance and remover of chaos. Some people want to get away from that, they need to keep going on the crazy ride. Maybe for some it is seen as needed as it lowers stress hormones in a study or two which have shown higher dopamine, serotonin, lower cortisol and lower testosterone in men from listening to music (which was probably not metal or excessively stimulating music). Oxytocin, triggered by soothing music and love relationships, lowers testosterone in men. In my case, I feel that my basal dopamine is pretty high and listening to too much music stimulates excessively. For instance, excess dopamine plays a role in Schizophrenia so we can deduct a limit for optimal thinking. Nowadays, I prefer to listen to 2 or 3 songs in a row and enjoy them while being involved emotionally then return to silence. I find that listening to music constantly also devalues the experience.