Perform: One Player may play 1 card now.
Accompany: You may use a Power now. If you do, destroy this card.
If I use Alacritous Subdominant's Accompany to use a power with AA -- and the power is an instrument that lets me play an Accompany from a Harmony, can I use Alacritous Subdominant again? After all, I haven't finished processing the first sentence, so it won't have been destroyed yet...
Yes you can, it's an awesome little trick.