I do love me some classical Ayu songs, but the "mash-up" thing has me worried - a (hopefully live) orchestra will somehow incorporate classical pieces into Ayu songs? It's not that I automatically think it will be bad, but rather that I cannot imagine how it would turn out and I'm fearing for the worst.
What I'm hoping for, at least, is something like "A Classical" but with different songs. I still listen to that album (partially and in whole) every once in a while because it is quite awesome.