Difference between 128 kbps and 320 kbps?

[noidea]

Am I the only one who got the test right? The drums were much clearer in the 320k version. And I even got the difference on speakers that costed 5 Euros.

To answer your question: Yes, there is a difference, but how big the difference is depends mostly on the following things:
1) Your ears, over 80% of all people between 10 and 50 have hearing problems(including me)(mostly without knowing) so for many people it doesnt make a giant difference.
2) Your speakers/headphones/earphones, you wont hear a big difference on, say, these headphones that come with the iPod
3) the device you use to play/soundcard(if you use a computer) theres a giant difference between the sound of bad and good mp3 players for example
4) the songs, simpler songs will have less difference, but songs that are full with many instruments and a big range will sound very different
5) the encoding, how good a mp3 file of the same bitrate is differs depending on how good the encoder is, because mp3 cuts out noice and the encoder needs to find WHAT it has to cut out, some do a better job, some a worse

so, you can basically say: yes, there is a difference, but in some listening enviroments and cases there is only minimal difference, for that website of yours....i would rather try to get these of ebay or something, even if it takes longer and might be more expensive, even 320k mp3 is way worse than the original already(CD has 1411 kbits, vinyl around 4500 kbits)