Conversation so far:
Where was the singer Ai born?
Ai was born in Los Angeles in 1981.
When did Ai first show interest in music?
Ai was motivated to become a singer in her early teens.
what kind of music did Ai perform as a teenager?
Ai became a member of the school's gospel choir.
was Ai raised in a religious environment?
when did Ai change from gospel music to other kinds of music?
In 2004, Ai won the Space Shower Music Video Awards' award for Best R&B Video, with her song Thank U.

Question: what happened in 1999?
Self-contained rewrite: what happened to Ai in 1999?