I just heard from a bassoonist in Christchurch, New Zealand. He told me that an important building for musicians in Chch called the Music Centre, an old restored brick convent, was heavily damaged by the quake.

I don't have any word about the Town Hall auditorium where the Christchurch Symphony plays.

I received another email from the Christchurch bassoonist. The Music Centre building wasn't damaged as much as first thought. Furthermore,
The Town Hall auditorium where the symphony plays has been cleared as safe.