Orfeo

Orfeo turns MIDI files into visual piano lessons, helping you see, hear and understand the music you're learning. Notes fall onto an on-screen keyboard, keys light up as they play, and chords are identified in real time. Slow down difficult passages without changing pitch, loop tricky bars, and practise each hand with colour-coded notes.

But Orfeo is more than a MIDI player. Explore chords, scales and progressions, discover how harmony works, connect a MIDI keyboard to play along, or edit tracks, notes, instruments and tempo to make a song easier to learn. A built-in mixer and additional sound sets let you shape the sound to your liking.

Key features

• Visual piano-roll playback with falling notes and an illuminated on-screen keyboard
• Adjustable tempo without changing pitch
• Looping, count-in and practice tools for difficult passages
• Left- and right-hand note colouring
• Real-time chord recognition and chord progression previews
• Interactive chord, scale and Circle of Fifths explorers
• MIDI track and note editing, with changes saved to a new copy
• Built-in mixer with volume, panning, reverb and chorus
• MIDI keyboard support
• Support for MIDI, MusicXML, Guitar Pro, Capella and karaoke MIDI files

Orfeo is free forever, open source under the GPL-3.0 licence, and runs on Windows 10 and 11. It works offline, requires no account or subscription, displays no ads, and collects no telemetry. Your music stays on your computer, and your original files are never overwritten.

Inspired by the discontinued Mac app Rondo and rebuilt from scratch by SquareBow in Slovenia, Orfeo puts the music first — not points, streaks or subscriptions.

Bring your own music. Learn it at your own pace.