If Angel is just one of them, what's her story? Considering she seems to be the strongest entity there, it would be reasonable to assume she has also been there longer than anyone else and has thus had the most time to get to know and put to use the strange possibilities available. Based on her single line in this episode and her inaction during the concert I suppose she believes she's doing the right thing but considering she's not some godly entity, it's just her own opinion, not the order of that strange world (be it purgatory or a shared coma world or anything else).

The music was indeed very nice. Too bad Iwasawa is gone now and with her the music as well, I reckon.