How do you share USB MIDI information from a digital piano with only 1 USB B midi Output to a Rasberry Pi and Computer?

I need my LED lights to recieve a midi signal to respond. I also need my computer to receive a MIDI signal to capture the MIDI for the visual. The problem is my piano only accepts 1 USB B port. I have tried to share the USB/MIDI information by googling a USB splitter like how you would solve this problem with a headphone splitter and share audio from 1 source to two listening devices. But I have come to realize that it doesn't seem to be this simple. I have tried USB switches hoping they would work but they are the opposite of what I want. Has anyone solved this problem?