Implement fugue generator from melody subject

[Copilot]

Creates a program that generates three-voice fugues from a melody subject, outputting both text and MIDI formats.

Implementation

• Core Engine (fuga.py):

  • Note class: Parses note notation (C4, D#4, Bb4, REST) with duration support, handles transposition
  • Voice class: Manages note sequences with timing
  • FugueGenerator: Implements traditional fugue structure:
    • Voice 1: Subject at t=0
    • Voice 2: Answer (subject +7 semitones) at t=subject_duration
    • Voice 3: Subject at t=subject_duration*1.5 (stretto)
  • MIDI export via midiutil library

• Input Format: Text file with NoteName Duration per line

  • Supports sharps (#), flats (b), and REST
  • Fractional durations handled precisely (no truncation)

• Error Handling: Warns on invalid notes/durations, continues processing valid entries

Example

Input (example_subject.txt):

C4 1.0
D4 1.0
E4 1.0
F4 1.0
G4 2.0

Output:

$ python fuga.py example_subject.txt
# Generates fugue.txt and fugue.mid

The text output displays all three voices with complete note sequences; MIDI file contains 3 tracks at 120 BPM.

Original prompt

Make a program which accomplishes the following task:
The program should make a fugue(musical composition) based on a melody (subject).
Input for the program is a text file with notes for one voice. Notes should be easy to edit with a text editor such as notepad.
The output should be also in text format and additionally a midi file should be generated.

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