Heh heh, Listen to any sort of instrumental music with lots of strings, cymbals, or any type of accoustic instrument playing at once, and you'll see 128kbps won't cut the mustard. Pop music where there's few dynamics and much of the sounds repeat, maybe then with a newer codec (ogg vorbis, aac, or even wma) but not mp3 for sure. Nothing at 64kbps is even close to FM quality....128kbps is my FM quality. 
Granted, have you tested all this yourself, and with what type of music and what type of speakers/headphones? You can get away with the 128kbps stuff on portable players if you're using them in noisy environments (streets, cars, exercising, etc.), but not for anything when you're in a reasonably quiet place..
I hate debating but I really have a stand on these kinds of things

The music I listen to includes almost no pop, now, keep in mind, I may notice a difference, and just since I enjoy the song as is, don't register it since it doesn't bother me, if I'm making a remix, regardless of whether I mind or not, I try to get the best sample I can, and I save it with as little loss as I can, but I have very nice stereo speakers that hook up to my computer with a USB, and I'm just not bothered by anything above probably 96, but below that I have problems usually...
I listen mainly to Linkin Park and have since probably 2002, their earlier stuff doesn't amount as much in this way, but in later music (2003-) they've hired orchestrae, they've had multiple layers to music, and some things they do on their CDs they can't do live because it's just too expensive... and I don't have a problem listening to 128 compared to 320, and as a drummer I listen to every part of the music, because the bass and drum are the last sections that you usually listen to for the most part... it's just how we are I guess, I've never felt like I am 'missing' anything really on lower qualities, however, on live tracks, I can't stand anything but a soundboard recording unless I have no choice, because audience members have the tendency to sing off-key, and the audience recordings are not usually done well...