Music Theory Companion
v7.5.3 · 15 MB · code 107
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File information
UpdatedFeb 20, 2026
PublishedJul 17, 2021
Packageapp.pg.scalechordprogression
Versionv7.5.3 (107)
Size15 MB
MD5d04e480f27bc951a5ff4e75e95558f76
Min SDK23
ABIsx86, x86-64, armeabi-v7a, arm64-v8a
Malware scanTRUSTED
Signature SHA1D7:46:07:5D:1C:46:43:04:5A:30:BD:31:E8:E5:4D:B2:27:69:1B:5B
SignerCN=Prasenjit Ghosh, OU=self, O=self, L=Kolkata, ST=West Bengal, C=700091
Total downloads500,000
This version500,000
DeveloperPG App Studio
Age ratingEveryone
What's new in v7.5.3
✔ Piano - played keys are highlighted on piano scroll
✔ Piano - key size increase/decrease buttons are now available in full screen
✔ Piano - playing diatonic chords is improved
✔ Piano settings are organized in a better way
✔ Fixed few bugs
✔ Piano - key size increase/decrease buttons are now available in full screen
✔ Piano - playing diatonic chords is improved
✔ Piano settings are organized in a better way
✔ Fixed few bugs
Security scan
TRUSTED
- Developer signature verified 2026-02-20
- Signature SHA1 D7:46:07:5D:1C:46:43:04:5A:30:BD:31:E8:E5:4D:B2:27:69:1B:5B
- File MD5 d04e480f27bc951a5ff4e75e95558f76
How to install Music Theory Companion v7.5.3 on Android 6.0 Marshmallow+
Takes about 2 minutes. You'll need roughly 15 MB of free storage.
- Grab app.pg.scalechordprogression_107.apk — hit the Download button above (15 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches d04e480f27bc951a…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find app.pg.scalechordprogression_107.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Prasenjit Ghosh, OU=self, O=self, L=Kolkata, ST=West Bengal, C=700091. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Music Theory Companion — tap Open on the install screen, or find the Music Theory Companion icon in your app drawer (this build targets x86/x86-64/armeabi-v7a/arm64-v8a devices).
Common install errors for Music Theory Companion
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 6.0 Marshmallow or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.
- Works on one phone but not another — this build ships x86/x86-64/armeabi-v7a/arm64-v8a native code. Devices with a different CPU will reject it.