I never thought of teeny-bopper to be anything other than a more or less disparaging term for mindless early teen musical preferences. I couldn't realte it to anything specific today, but generically anything that resulted in a "It's got a good beat and I'm not baffled by the lyrics; You can dance to it; I'll give it an 85" could qualify as teeny-bopper. Tween is whatever the age gap is before 13 and after little kid. I wouldn't be surprised of that were much lower than it was when geezers such as Juan and me were in that group