Totally stuck on 2 please. 19a: Langgaard Symphony 9 is initially playing (5) I have i?i?n
I think it might be "ision" but have looked up this symphony but cannot find any reference which would fit the grid I have.
20a: Accrue most of genuine piano (4) I have r?a? I assume it's "real" but not sure how that fits the clue.