anchor.diff:  "Song","Rock and Roll Music"
   "Song","I'll Follow the Sun"
   "Song","Mr. Moonlight (song)"
  -"Song","Kansas City (Jerry Leiber and Mike Stoller song)"
  +"Song","Kansas City (Leiber and Stoller song)"
   "Song","Hey-Hey-Hey-Hey!"
   "Song","Eight Days a Week"
   "Song","Words of Love"
   "Song","Honey Don't"
  -"Song","Every Little Thing (song)"
  +"Song","Every Little Thing (Beatles song)"
   "Song","I Don't Want to Spoil the Party"
   "Song","What You're Doing"
   "Song","Everybody's Trying to Be My Baby"
  
positive.code: "Album","Abbey Road"
  "Album","Hey Jude (album)"
  "Album","Let It Be"
  "Album","1 (The Beatles album)"
  "Album","Love (The Beatles album)"
  "Song","Love Me Do"
  "Song","P.S. I Love You (Beatles song)"
  "Song","Please Please Me (song)"
  
negative.code: "Song","Happiness Is a Warm Gun"
  "Song","Martha My Dear"
  "Song","I'm So Tired"
  "Song","Blackbird (Beatles song)"
  "Song","Piggies"
  "Song","Rocky Raccoon"
  "Song","Don't Pass Me By"
  