Memories are not static or passive, but rather dynamic and evolving, subject to constant revision and reinterpretation. The meaning of a song can’t be summed up by an appeal to the notes that constitute it, and if an especially emotional memory becomes associated with a song at any point, you will probably never hear it the same way again. That song you loved when you were dating so-and-so might be difficult to listen to after an acrimonious breakup. Hearing it and experiencing those negative feelings will cause these new negative feelings to become attached to the memory and then stored along
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