Well my Panny 220 can't play DVD Audio or any of the niche digital audio disc formats that never panned out.
So I'm looking to try out discs which may use HD or lossless audio with music.
Just looking around Amazon, there are some music videos and concert discs which have DTS-MA sound tracks. A couple of them are operas so I wonder if the surround channels are rendering the ambience of the performance venue (one is at the old Arena in Verona so it would be a stage surrounded by people, I would imagine).
I'm not sure though that live performances have the best capture of music. Maybe some high-tech studio would be better-equipped to record with more capable equipment.
Then again, even with just ambiance, maybe a live concert is really the best use of multichannel music content?