The idea of AKB48's producer Yasushi Akimoto was to create a girl group that, unlike a regular pop group, which gives occasional concerts and that is mostly seen on TV, would have its own theater and perform there on a daily basis; the fans would always be able to go and see the girls live. Presently, AKB48 still performs at the theater everyday (as you can see in their official website schedule), although, due to great demand, tickets are now distributed only via a lottery.
Check out some of their PV's below!
AKB48 OFFICIAL YOUTUBE CHANNEL
And their official website here!
AKB48 OFFICIAL WEBSITE