[link to original on tumblr]
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The bass part at the end of the song just repeats the same figure (G D E G' E D G), and in some ways, this figure represents the mutual wanting in the title and lyrics. There are two G notes in the figure, and they're an octave apart. The phrase involves moving from one G up to the second and then back down to the first. So the ascent represents "I want her," and the descent is the reciprocal "She wants me."