This episode was chart brass!
I'm a longtime aficionado of Japanese/Chinese/Korean pop culture, so I always get excited when they make an appearance, ever since the "Winter Fairy" song way back in the beginning of the podcast. After the disappointingly Gaga-heavy Japanese chart from a while ago, the K-pop chart delivered.
If the rotating leader mechanism in T-ara was fascinating to anyone, I'd recommend looking up Hello! Project, which is a massive J-pop outfit responsible for the long-running Morning Musume group, which features a similar almost collegiate atmosphere, with new singers being recruited every year, group leaders, sub-groups, graduations, and bands made up of post-graduate members.
http://en.wikipedia....i/Hello_project
http://en.wikipedia..../Morning_Musume
I like the idea of "retro" charts as mentioned above, it could be a fun way to tie things into the guests even more, maybe pull up Billboard charts for a guest's birth day/year... we did something like this at my office once and had a big day-long goof-off where we played the Billboard #1 songs from our birth weeks.