I won't claim to understand enough about technology to know if, or why, this might make an audible difference, but I'd bet that it most assuredly isn't bad news for those of us who rip our CDs to iTunes, right? http://www.macrumors.com/2011/06/11/itunes-10-5-beta-is-64-bit-and-cocoa/
It's not bad news and it's not good news for ripping CDs and managing your music with iTunes. Just compiling and linking it to run in 64bit mode won't make any difference except for a little bigger size of the image.
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