kuno: 091225 is the date
They had a special stage with Taec from 2pm. They each did a short dance for different songs and then danced to "3" by Britney. Then Taec came out and they all peformed "My Ear's Candy"
Thnaks, that helps! Maybe I'll have to seek that out. HyunA looked better back then, and she seemed more "into it" when performing, compared to now.
Edit: Found that Music Bank performance
Wow.