In the scene where the tuba player is complaining about the money he lost, is the woman with whom he's having sex Mia, the woman who keeps on complaining that nobody understands her in previous scenes?
To me, it quite looked that it was her.
No. I believe it was the woman from the beginning who slams the door causing the picture to fall off the wall into the fish tank.
shareAlso, I was wondering about the significance of her wearing the tuba player's pointed performance helmet. Phallac? And she is on top, while he is on the bottom disinterested in the sex while she brings herself to orgasm.