I DON'T CARE if your heart rests with country twang, surf harmonies, acid riffs, folk strums, commercial muzak, or Anglophile accents. There's one thing that ties all great pop music together. That one thing is energy. There must be a vitality, imagination, and creative spark to make it all worthwhile — usually this energy is a sound, but it can also come with an image, or merely an idea. This sound, image, and idea concept of pop is in reality like a spherical scale.