MIDI over USB

[RuudNL]

Hello,
I would like to try to do this, but I don't know if this is possible...

I would like to behave a PIC based circuit as an (USB) MIDI (receiver) interface.
In the past I have managed to create circuits with a PIC that behaved like a HID device, that didn't need any drivers.
The point of this is, that most software applications need to 'see' a MIDI port, in order to send information to that port.
I suppose I have to change some values in the USB descriptors, but I have no idea where to start.
Most commercial USB to MIDI interfaces don't need a driver, so I suppose this must be possible.
Maybe somebody has experimented with this, and is willing to share some code with me?
Many thanks in advance!

(Just to be clear: I only need communication FROM the PC to the PIC circuit.)