Conversation so far:
Where does the Vienna Boy's Chior perform?
The Vienna Boys' Choir sing almost every Sunday (except summer) at Wiener Hofburgkapelle in the Imperial Palace. Their most traditional location boasts excellent acoustics.
How large is the Vienna Boys Chior?
There are approximately 100 choristers in the Vienna Boys' Choir between the ages of nine and fourteen. The boys are divided into four touring choirs: Bruckner, Haydn, Mozart and Schubert.
Were the Vienna Boys Chior able to get enough recruits to keep going?

Question: How have they changed their image?
Self-contained rewrite: How have the Vienna Boys Chior changed their image?