I reluctantly said goodbye to my little bed, my Bay City Rollers wall posters, my bookshelf of Nancy Drew mysteries, my mismatched dresser and my swimming trophies.

Inside the small room, under a poster of guitar legend Jimi Hendrix posing as Uncle Sam, four young Shanghainese women—the other members of Sammy's punk rock band, Black Luna—are starting to jam.

Prunella traded her rock star poster.