MIDI in on Leonardo via MidiUSB

Hello there!
I'm trying to read MIDI from an electronic keyboard and would appreciate if you could tell me if I'm properly reading MIDI over a USB connection. I'm going to control some LEDs, but I need to get this part down before I can move forward to LED manipulation.

The code I'm using is as such

#include <MIDIUSB.h>
#include <MIDIUSB_Defs.h>
#include <frequencyToNote.h>
#include <pitchToFrequency.h>
#include <pitchToNote.h>

void noteOn(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOn = {0x09, 0x90 | channel, pitch, velocity};
  // The notes on a keyboard go from 21 to 108. To get the first note to correspond to the first LED, I'm going to subtract 21 from the pitch number and store it. 
  short R = pitch-21;
}

void noteOff(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOff = {0x08, 0x80 | channel, pitch, velocity};
  //Here, we will a. correlate a MIDI note to a key b. turn off that key's associated light
  short R = pitch-21;
}

void setup() {
}

void loop() {
    midiEventPacket_t rx;
    rx = MidiUSB.read();
}

The code here is based off the MIDIUSB github's "read" example.

My main question is: I believe "pitch" is the numeric representation of the midi note. Is this correct? If using MIDIUSB, do I need to specify noteOn and noteOFF like with the standard serial MIDI library? Once I know how to move forward, I already know how to play with the lights.
Thank you for your time.

I'm trying to read MIDI from an electronic keyboard

You can’t do that.
A keyboard is a USB client device and so is a Leonardo. You can only connect a client to a host. So you would need a USB host shield to do this.

Something like this:-
http://www.hobbytronics.co.uk/usb-host-midi