Bluebeats.com's lawyer is reportedly basing the site's defense on "psychoacoustic simulation," an "arcane" technology that supposedly produces music enables it to sell music that sounds identical to recordings without actually infringing on any copyrights.
Images can be manipulated to a certain extent to no longer be considered infringing on a copyright. Therefore, the same should apply to music. Of course, unless they changed the lyrics somewhat, it doesn't really matter what it sounds like. Music is a complex beast. There's the actual performance (the guitar riffs, drum solos, vocal talent) that are aural pieces of work (like a painting is visual), but then the lyrics themselves are protected like a book.
It will be interesting to see the outcome of this, asusming the judge isn't just a Beatles fan and instantly rules in Apple Corp's favor.