Tune generator (improved)

#!/usr/bin/env python3

import random
# import pyperclip

#         0    1    2    3    4    5    6    7    8    9    10   11
notes = ["G", "A", "H", "C", "D", "e", "f", "g", "a", "h", "c", "d"]
virtual_piano = ["5", "6", "7", "8", "9", "0", "q", "w", "e", "r", "t", "y"]

chords = [[[1, 3, 5, 8, 10], [0, 0]],
          [[2, 4, 6, 9, 11], [4, 6]],
          [[0, 3, 5, 7, 10], [5, 5]],
          [[4, 1, 11, 6, 8], [4, 6]],
          [[0, 2, 5, 7, 9], [0, 0]],
          [[1, 3, 6, 8, 10], [1, 3]],
          [[0, 2, 4, 7, 9, 11], [0, 0]]]

def generate_note(current_note_index):
    note_index_delta = 0
    halt_flag = random.randint(0, 1)
    while halt_flag != 1:
        note_index_delta += 1
        halt_flag = random.randint(0, 1)

    sign_number = random.randint(0, 1)
    if sign_number == 0:
        test_note_index = current_note_index + note_index_delta
    else:
        test_note_index = current_note_index - note_index_delta
    return(test_note_index)

def pick_chord():
    global first_launch_flag
    global chord_index
    if first_launch_flag == 1:
        first_launch_flag = 0
    else:
        chord_index = random.choice(chords[chord_index][1])
    return(chords[chord_index][0])

break_flag=""
while break_flag != "q":

    first_launch_flag = 1
    chord_index = random.randint(0, 6)
    current_note_index = random.randint(0, 11)
    to_clipboard = ""

    phrase = input("Enter the structure: ")
    words = phrase.split(" ")

    for word in words:
        syllables = list(word)
        for syllable in syllables:
            if syllables == "+":
                chord_notes = pick_chord()
                test_note_index = generate_note(current_note_index)
                while test_note_index < 0 or test_note_index > 11 or test_note_index not in chord_notes:
                    test_note_index = generate_note(current_note_index)
                print(notes[test_note_index], end = "\t")
                to_clipboard += notes[test_note_index] + "\t"
            else:
                test_note_index = generate_note(current_note_index)
                while test_note_index < 0 or test_note_index > 11:
                    test_note_index = generate_note(current_note_index)
                print(notes[test_note_index], end = "\t")
                to_clipboard += notes[test_note_index] + "\t"

    # pyperclip.copy(to_clipboard)
    print("")
    break_flag = input("?:")