Jim (or anyone else who could answer this),

I'm presuming that it's Zildjian, but which model of gong is the opera gong? And while we're on it, what about the other gong sounds, aside from the tam-tam and wind gongs? Thanks!

I'm not sure I remember all of them, but most (all?) the Chinese gong sounds were actually different styles of wuhan gongs. Some of these are OEM models that Zildjian has put their label on, but they aren't actually made with Zildjian alloys. You can find these opera gongs at Steve Weiss at pretty surprisingly low prices.