I already know 2ne1's and SNSD's concept, its' hard to explain what the other group's concepts are:
BEG (brown-eyed girls)
1.f(x)->>pop & rock...they are different,have weird style and tend to be unique! ;)
2.After School->>well they are like pop,hip-hop,r&b girl group...They don't have that 'sweet' style as SnSd neither they act like that!...+ they like to show their talents in their mvs like~tap dancing (in Shampoo mv)~ or ~drumming (drum playing)->(in Bang).
3.4minute->>their music style is also pop & dance-pop!!...+ they kinda remind of 2ne1 cuz of their songs,performances and dressing style! ;)...they are like'bad girls' :D
4.Miss A->>pop,dance-pop & electropop style!...and neither they have that 'super good girl style'.
>>>well don't know if I explained well but I hope I did XD...N can't say anything about other groups cuz I don't know them that well.
WELL I WILL TELL YOU 4 GROUP concept
well let start with f(x) style is kind of not girly like snsd or kara there like some hip hop style. and then kara is some time cute some time not, like there mv for lupino there style is not as they wear allways and in there mv for hony they wear cute and sweet style. Rainbow is kind of like snsd style they wear short jeans just like snsd. T-ara is allmost like kara they wear cute and some time not just like kara.
well that all nd sorry idont tell you all the group. if you dont understand tell me ok