Certainly! I can provide you with an example of code in Python that generates MIDI notes using the mido library to create a simple urban hip-hop beat:
```
import mido
import time

# Set the tempo of the beat
BPM = 120
# Calculate the duration of a quarter note in seconds
QUARTER_NOTE_DURATION = 60 / BPM

# Create a new MIDI file with one track
midi_file = mido.MidiFile(type=0)
track = mido.MidiTrack()
midi_file.tracks.append(track)

# Define the notes and velocities to be used in the beat
notes = [36, 38, 42, 46, 49, 50, 51, 52]
velocities = [80, 90, 100, 110]

# Define the sequence of notes to be played in the beat
sequence = [
    [0, 0, 0, 0, 0, 0, 0, 0],
    [1, 0, 0, 0, 1, 0, 0, 0],
    [1, 0, 1, 0, 0, 0, 1, 0],
    [0, 0, 0, 1, 0, 1, 0, 0]
]

# Iterate over the sequence and add notes to the MIDI track
for i, beat in enumerate(sequence):
    for j, note in enumerate(beat):
        if note == 1:
            # Choose a random note and velocity from the lists
            note_number = notes[j]
            velocity = velocities[i % len(velocities)]
            # Create a MIDI message for the note and add it to the track
            note_on = mido.Message('note_on', note=note_number, velocity=velocity, time=0)
            note_off = mido.Message('note_off', note=note_number, velocity=0, time=int(QUARTER_NOTE_DURATION * 0.9 * mido.second))
            track.append(note_on)
            track.append(note_off)
    
    # Add a pause between beats
    time.sleep(QUARTER_NOTE_DURATION * 3)
    
# Save the MIDI file
midi_file.save('urban_hip_hop.mid')
```
This code creates a new MIDI file with one track and defines a sequence of notes to be played in the beat. It then iterates over the sequence and adds notes to the MIDI track using random notes and velocities from predefined lists. The code also adds pauses between beats using the **time.sleep** function. Finally, the MIDI file is saved to disk.
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