I like to think of energy in a song (in terms of freq) to be around 1-3khz ie the main part of vocals. The power of the mix comes from the lowend, 250Hz and down. The presence, clarity and 'expensiveness' comes from about 6Khz and up while the low mid stuff in the 300-800hz range is what can either destroy or make a mix, it contains certain tones and spatial elements that help in defining the instruments around it. Then it also comes to what others were talking about above in terms of the songwriting itself.
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