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https://github.com/kennethreitz/pytheory.git
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kennethreitz
9da3ac8b28
- circle_of_fifths.py — visualize keys around the circle - chord_identifier.py — identify chords from notes and fingerings - key_explorer.py — explore keys, signatures, progressions, borrowed chords - temperament_comparison.py — compare equal, Pythagorean, and meantone - chord_tension.py — analyze tension, consonance, and voice leading - world_scales.py — scales from 6 musical traditions - fretboard_explorer.py — instruments, tunings, capo transposition - midi_converter.py — MIDI ↔ note ↔ frequency reference - progression_writer.py — famous progressions, Nashville numbers, random generation - interval_trainer.py — interval names, songs, and consonance ranking - overtone_series.py — harmonics and why chords sound good - key_detection.py — detect keys from melodies and chord progressions Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
75 lines
2.7 KiB
Python
75 lines
2.7 KiB
Python
"""Explore instruments, tunings, and chord fingerings."""
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from pytheory import Fretboard, CHARTS
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# ── Compare Instruments ─────────────────────────────────────────────────
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print("Instrument Tunings")
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print("=" * 55)
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instruments = [
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("Guitar (standard)", Fretboard.guitar()),
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("Guitar (drop D)", Fretboard.guitar("drop d")),
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("Guitar (open G)", Fretboard.guitar("open g")),
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("Guitar (DADGAD)", Fretboard.guitar("dadgad")),
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("Bass", Fretboard.bass()),
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("Ukulele", Fretboard.ukulele()),
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("Mandolin", Fretboard.mandolin()),
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("Violin", Fretboard.violin()),
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("Banjo", Fretboard.banjo()),
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("Bouzouki (Irish)", Fretboard.bouzouki()),
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]
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for name, fb in instruments:
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tuning = " ".join(t.full_name for t in fb.tones)
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print(f" {name:22s} {tuning}")
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# ── Guitar Chord Chart ──────────────────────────────────────────────────
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print()
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print("Guitar Chord Chart (standard tuning)")
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print("=" * 55)
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fb = Fretboard.guitar()
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chart = CHARTS["western"]
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for chord_name in ["C", "G", "D", "Am", "Em", "F", "A", "E", "Dm", "G7", "C7", "Am7"]:
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f = chart[chord_name].fingering(fretboard=fb)
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print(f" {chord_name:5s} {f}")
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# ── Capo Magic ──────────────────────────────────────────────────────────
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print()
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print("Capo Transposition")
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print("=" * 55)
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print(" Playing open chord shapes with a capo changes the key:")
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print()
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open_shapes = ["C", "G", "D", "Am", "Em"]
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for capo_fret in range(1, 6):
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fb_capo = Fretboard.guitar(capo=capo_fret)
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results = []
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for shape in open_shapes:
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f = chart[shape].fingering(fretboard=fb_capo)
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actual = f.identify() or "?"
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results.append(f"{shape}→{actual.split()[0]}")
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print(f" Capo {capo_fret}: {', '.join(results)}")
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# ── Same Chord on Different Instruments ─────────────────────────────────
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print()
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print("C Major on Different Instruments")
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print("=" * 55)
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c_chord = chart["C"]
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for name, fb in [("Guitar", Fretboard.guitar()),
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("Ukulele", Fretboard.ukulele()),
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("Mandolin", Fretboard.mandolin()),
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("Banjo", Fretboard.banjo())]:
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try:
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f = c_chord.fingering(fretboard=fb)
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print(f" {name:12s} {f}")
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except Exception:
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print(f" {name:12s} (not available for this tuning)")
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