Conversation so far:
What is interesting about the Vienna Boys' Choir's recent history?
Gerald Wirth became the Vienna Boys' Choir's artistic director in 2001. However, since then, the choir has come under pressure.
Why has Vienna Boys' Choir come under pressure since Gerald Wirth became their artistic director in 2001?
The Vienna Boys' Choir has come under pressure to modernize and has faced criticism of their musical standards, leading to a split with the Vienna State Opera.
What changes did the Vienna Boys' Choir make under pressure to modernize?
The Vienna Boys' Choir has for the first time had to advertise for recruits after a rival choir school was established by Ioan Holender, director of the opera company.

Question: Has the choir had any controversies?
Self-contained rewrite: Has the Vienna Boys' Choir had any controversies?