from typing import List


def midi_note_on(note: int, channel: int = 0, velocity: int = 64) -> List[int]:
    """MIDI 9nH message - note on.

    >>> midi_note_on(70)
    [144, 70, 64]
    >>> midi_note_on(70, velocity=127, channel=15)
    [159, 70, 127]
    """
    status = 0x90 + channel
    return [status, note, velocity]