They have slowed down a lot in terms of releases and concerts since they aren't as popular as they were during the 2010-2013 era, but it's still a lot. In 2017 alone they released... Spoiler AKB: 1 album + 4 singles (41 new songs) SKE: 1 album + 1 single (13 new songs) NMB: 1 album + 1 single (11 new songs) HKT: 1 album + 2 singles (17 new songs) NGT: 2 singles (12 new songs) STU: - (debuted in January '18) For a whooping total of 94 songs that nobody has the time to listen to. And that's not counting the rival groups (Nogizaka46 and Keyakizaka46) that churn out their own share. Hence why another of their yearly events is the Request Hour, where the fans vote for their favourite songs and the (usually) Top 100 is performed in 4 concerts in 2 days.