https://news.ycombinator.com/item?id=8217454

bayan.py

#!/usr/bin/env python3

import sys

keys = {
    'C4': 'q', 'C#4': 'a', 'Db4': 'a', 'D4': 'z',
    'G4': 'd',
    'E5': 'h',
    'C5': 't',
    'G5': 'j',
}

with open(sys.argv[1]) as f:
    for line in f:
        for note in line.split(' '):
            note = note.strip()
            print(keys[note], end='')
    print()

example.txt

E5 E5 E5 C5 E5 G5 G4