NSYNC or Menudo

• Group of singers dreading puberty, probably
• One Direction, for one
• On the banks of Russian river, going up with 1D?
• 'N Sync or Menudo
• Third part of the mnemonic + ensemble = ___
• One Direction, for example?

Wikipedia Word definitions in Wikipedia
Boyband was a short-lived New Zealand pop vocal group created in September 2006 from the winners of The Edge radio station's promotion to manufacture New Zealand's own boy band . The Edge Radio station hosted auditions across the New Zealand to find the ...

Wiktionary Word definitions in Wiktionary
n. (alternative form of boy band English)