Conversation so far:
What was unique about Girl Generations lyrics or themes?
Although most Girls' Generation's releases are written by songwriters for S.M. Entertainment, some members occasionally participated in songwriting.
Who was some of the girls who did the songwriting for Girls' Generation?
Member Yuri wrote the lyrics for Mistake.

Question: What year was the song released?
Self-contained rewrite: What year was the song Mistake released?