The USB version of the new Beatles box set includes both 24bit/44.1khz flac & 320kbps lame 3.98 cbr. So, while going through and re-tagging the mp3 files, I was listening to their flac counterparts. Throughout Revolver I was hearing details I've never noticed, even recording errors. Wow, I thought, the new mixes really do take advantage of the expanded dynamic range. After Revolver I was about to put the next album on when I noticed that I had accidentally queued up the mp3 version instead of the flac one. So, yes, I've been able to hear small differences, mainly vocal distortion, between lossless and mp3, but even in serious listening I wasn't able to tell the difference with the Beatles. Although these are forty-year-old recordings originally mixed in mono with "kid at the candy store"-style gusto and limited dynamic range.