Piano Companion is a music theory reference app for songwriters, producers, teachers, and students. Look up any of 1,500+ chords or 10,000+ scales instantly, build progressions, and explore harmony on iOS, Android, and Mac.
Whether you're stuck on a progression, blanking on a scale name, or just exploring — Piano Companion gives you the answer in seconds. Press the keys you know, and it tells you what you're playing.
Search by name or tap the keys you know. Piano Companion identifies what you're playing — even from a MIDI keyboard.
The Chord Progression Builder suggests chords that fit your key. Experiment with patterns, listen back, and find what sounds right.
See notes on the grand staff, fingering for both hands, intervals, degrees, and compatible scales — all in context, not abstract textbook diagrams.
Without this file in the correct system directory, your Android device will only act as a peripheral (like a storage drive when plugged into a PC) rather than a host. The Risks of Downloading This File Online
Missing kernel driver or hardware limitation. Solution: The XML file only tells Android the software feature exists. You also need a kernel with CONFIG_USB_OTG enabled. Check your custom kernel version.
While enabling USB Host mode expands device utility, it involves risks. Modifying the
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Even with the correct .xml file, users in 2021 faced specific issues. Here’s how to solve them.
/vendor/etc/permissions/android.hardware.usb.host.xml
Without this file in the correct system directory, your Android device will only act as a peripheral (like a storage drive when plugged into a PC) rather than a host. The Risks of Downloading This File Online
Missing kernel driver or hardware limitation. Solution: The XML file only tells Android the software feature exists. You also need a kernel with CONFIG_USB_OTG enabled. Check your custom kernel version. androidhardwareusbhostxml file download 2021
While enabling USB Host mode expands device utility, it involves risks. Modifying the Without this file in the correct system directory,
: /system/etc/permissions/android.hardware.usb.host.xml . androidhardwareusbhostxml file download 2021
Even with the correct .xml file, users in 2021 faced specific issues. Here’s how to solve them.
/vendor/etc/permissions/android.hardware.usb.host.xml
Available on every major platform. Start exploring chords and scales today.
