Rough Translation:
"Artist! ( female)
I am sitting down to present to you my respectful gratitude, while still rejoicing in my heart the beautiful sounds of your superb playing.
Sincere gratitude I sent to you for your divine music that you presented this afternoon. Be convinced that you have given me, considering myself a weak (feeble) performer, unforgettable moments.
So that your artistic path shall be covered by flowers and laurels is my fervent wish , believe me.
Your respectful admirer, Harts Hoflaan"? | Signature unclear