I think considering the blue ray quality of concert, this type of bluray disc will make the keeping of disc more worthwhile than most movie disc.

I have DVD version of the following which I think worth the mention. I have no idea where can I get the blue ray version of these:

1. joe hisaishi in nippon budokan-25 years with hayao miyaza
2. Ennio Morricone on Ennio Morricone - live concert of most of his famous movie theme works.

Those are timeless concert I think.