I often find that music de-energises me if I listen to too much of the same. If I stick on something and I'm just not in the mood for it, then that can make me feel really tired and down. But if I can put on music that matches my mood then I can really excel and tons of energy just appears from nowhere!
Sometimes I like to listen to classical music if I'm feeling calm, peaceful and relaxed. But if I'm feeling more revved up, there's nothing better to listen to (in my opinion) than some good old heavy metal/classic rock. If I need to get myself pumped up for a night out or to get me in the mood for doing something then I find there's nothing better than some classic sleaze metal (you know big hair/leather jackets). My personal fave is Motley Crue or Crashdiet! Lol!
So yeah, it all depends how your mood. Match your favourite types of music to your current mood, and you can't go wrong in my opinion! I personally couldn't imagine life without music. It moves me way too much!