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1.
The psychological phenomenon of your mind turning a pretty mediocre song into a much better song when you recall the song from memory. Disappointment is guaranteed when you actually hear a song again.
Guy: This song sucks...I'm suffering from a case of aural transmutation!

Girl: What's that?

Guy: I remember this song being a lot better in my head. My mind must have aurally transmuted it into a better song.

Girl: Don't feel bad, everybody has to do that with Justin Beiber's "My World"
by Actraiser81 May 11, 2011