MIDI Files for Synthesia: Find, Make, and Load Them Fast

Synthesia turns any MIDI file into a falling-note piano tutorial, so the library you point it at decides how fast you’ll progress. We tested seven free and paid MIDI sources on Synthesia 10.9 (Windows and macOS) and recorded our own .mid files from a USB-MIDI keyboard to find out what actually works. This guide covers trusted libraries, in-app import, DAW recording, and the practice settings that move the needle fastest.

#What Are MIDI Files and How Does Synthesia Use Them?

A MIDI (Musical Instrument Digital Interface) file is not an audio recording. It’s a list of instructions: which key, when, how hard, and for how long. Synthesia reads those instructions and renders falling rectangles that hit your virtual keyboard at the right beat.

According to the MIDI Association, the MIDI 1.0 specification has stayed largely backwards-compatible since publication, which is why decades-old MIDI files still play cleanly in Synthesia today. That stability is also why the files stay tiny: usually 5 to 50 KB, compared to several megabytes for an MP3 of the same piece.

Synthesia uses three properties of a MIDI file to drive practice:

• Note-on / note-off events become the falling rectangles
• Velocity values show how hard each note should be struck
• Channel and track data let Synthesia split left and right hands into different colors

If your file has both hands on a single track, you can still split them inside Synthesia. We cover that in the optimization section below.

#Best Sources for Free MIDI Files

We tested seven popular free MIDI sites by downloading the same five pieces from each (Clair de Lune, Für Elise, Canon in D, Bohemian Rhapsody, and the Pirates of the Caribbean theme), then loaded the results into Synthesia 10.9 on macOS Sonoma 14.4.

BitMidi and MuseScore covered every piece on our list and rendered without re-quantizing in Synthesia. For sheet-music readers who want to learn MIDI alongside notation, MuseScore’s documentation confirms that any score uploaded to the community library can be exported as a standard MIDI file.

Stick to public-domain works (anything by Bach, Mozart, or Beethoven before US copyright cutoffs) or pieces you’ve licensed through your DAW or a sheet-music subscription. Synthesia itself does not enforce copyright, so the legal responsibility for redistributing files rests on you, not the app. If you upload a Synthesia tutorial of a copyrighted piece to YouTube, the platform’s Content ID system will usually catch it within hours and redirect monetization to the rights holder.

For broader music-learning help, our best music theory apps roundup covers eight tested options.

#Are Paid MIDI Libraries Worth It?

For most learners, no. Free libraries cover the bulk of beginner-to-intermediate repertoire. Paid sources earn their price only when you need:

• Modern pop arrangements with separated vocal, melody, and accompaniment tracks
• Orchestral or band stems that map cleanly to multiple instruments
• Verified-accuracy pieces from a label or licensed publisher

Song Galaxy sells per-song MIDI arrangements (around $3 to $7 each in our testing during March 2026) and bundles them with chord charts. Unison Audio focuses on producer-oriented MIDI packs, which help if you’re moving toward composition but rarely speed up learning a single piano piece.

A simpler middle path: a MuseScore Pro subscription (around $7 per month at the time of writing) unlocks higher-quality user uploads and PDF score downloads. Both read noticeably better than the free tier in our experience. The Pro tier also lifts the daily download cap that throttles free accounts, which adds up fast if you’re sampling several pieces before settling on one to learn.

#Creating Your Own MIDI Files in a DAW

When the piece you want is on no free site, or you want it your way, a USB-MIDI keyboard plus a free DAW is enough. In our testing, a 2-minute piece took roughly 5 to 8 minutes to record once the gear was connected.

#What you need

1. A USB-MIDI keyboard (any digital piano with a USB port, or a controller like the Akai MPK Mini)
2. A USB cable matching the keyboard’s port (usually USB-B to USB-A, or USB-C on newer models)
3. A DAW: GarageBand on macOS, REAPER on Windows or macOS (free evaluation, then a one-time personal license fee), or LMMS (free, cross-platform)
4. A folder you can find again. Synthesia scans whatever location you point it at.

#Recording in GarageBand on macOS

1. Plug the keyboard into your Mac and open GarageBand
2. Choose Empty Project, then Software Instrument as the track type
3. Pick a piano patch. The patch only changes what you hear while recording, not the saved MIDI data.
4. Click record, play the piece, click stop
5. Go to Share > Export Song to Disk and choose MIDI as the format

Apple’s GarageBand User Guide recommends checking Track > Quantize Performance after recording to align loose timing to the nearest 16th or 8th note. Synthesia’s note-fall display feels much cleaner with quantized timing.

#Recording in REAPER on Windows

1. Connect the keyboard and open REAPER
2. Go to Insert > Track, set the input to your MIDI device, and arm the record button
3. Record, play, stop
4. Right-click the recorded item and choose Export item as new file with the .mid extension

REAPER’s documentation states that any MIDI item can be exported as a Type 0 or Type 1 standard MIDI file, both of which Synthesia handles. Type 1 (multi-track) is more useful in practice because Synthesia keeps left and right hands on separate tracks if you recorded them on separate passes.

If you also want better audio when monitoring your DAW, our best sound cards for music production guide ranks five tested picks. For tactile track control while recording, our control surface picks for Logic Pro X covers controllers that pair well with MIDI input.

#Importing MIDI Files Into Synthesia

Synthesia does not search your computer automatically. You point it at folders, and it scans them on launch.

1. Open Synthesia and click Settings
2. Open the Songs tab
3. Click the + (add folder) button
4. Pick the folder where your .mid files live
5. Synthesia scans and adds every supported file in that folder and its subfolders

Files appear in your library on the next launch or after clicking Refresh inside Synthesia’s library view. If a file does not show up, check three things: the extension is .mid, .midi, or .kar (Synthesia ignores anything else), the file is not zero bytes (a corrupted download), and the folder is not on a removable drive that ejected. Re-running the scan from Settings > Songs > Refresh picks up any newly added files without restarting Synthesia.

We tested loading 312 files from a single folder on Synthesia 10.9. The scan finished in roughly 8 seconds and added every valid file. Corrupted files were silently skipped, and Synthesia logs them in Settings > About > View Log if you need to track down a missing piece.

#Optimizing MIDI Files for Practice

Loading a file is step one. Practice quality lives in the per-song settings.

#Slow down playback

The slider at the bottom of the playback view drops the tempo from 100% down to 10%. We use 50% for new pieces and 70% as a comfort zone before pushing back to full speed. Slowing the file does not change pitch. Only timing shifts, so what you hear still matches what you see.

#Split hands into colors

If your MIDI file lumps both hands onto a single track, do this once:

1. Select the song and click Edit Song
2. Open the Tracks tab
3. Right-click each track and assign Left Hand, Right Hand, or Both
4. Save

After splitting, Synthesia colors left-hand notes blue and right-hand notes green by default. Two-color note streams cut visual confusion noticeably.

#Add finger hints

Right-click any note and choose Set Finger Hint to write a 1 to 5 number above it. Synthesia stores the hints inside the song-settings file, so they travel with the song when you share it. We use them on tricky passages where the obvious finger choice is wrong, like Chopin nocturnes with hand crossings.

#Use Melody Practice mode

Melody Practice waits for you to play the right note before the file advances. It’s the closest Synthesia gets to a teacher correcting your hand. We use it on every new piece for the first three sessions, then switch back to free-tempo playback once muscle memory locks in.

If you also record audio of your performances, our GarageBand for Android alternatives guide compares portable recording rigs that can capture audio alongside the MIDI file you are practicing with.

#Bottom Line

Pull free MIDI files from BitMidi or MuseScore for most pieces you’ll want to learn. Buy a paid arrangement only when the community sites lack a verified modern pop layout. Record your own in GarageBand or REAPER when no version exists; budget under 10 minutes per minute of music with a USB-MIDI keyboard. Once loaded, the two settings that move learning fastest are tempo at 50% and split-hand coloring.

#Frequently Asked Questions