Greetings!!!
There has been significant advancement since the last 64kbps test. The Nero HE-AAC and Aoyumi Vorbis encoders improved, Apple added HE-AAC capability, and we have a new low delay codec with high quality: CELT.
The following codecs are presented in this test:
Nero 1.5.4 HE-AAC
Apple QuickTime 7.6.9 HE-AAC
Ogg Vorbis AoTuV 6.02 Beta
CELT 0.11.2
http://listening-tests.hydrogenaudio.org/igorc/Public%20Multiformat%20Listening%20Test%20@%2064kbps.htm