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Learn piano chords and scales with ease using Piano Companion: chords, scales for music! Piano Companion: chords, scales for music is an application for Android devices that is essentially a huge dictionary of flexible chords and scales. This app can, in essence, help you to better understand certain chords and scales. Learn everything that there is about music theory and piano playing by using this nifty app, which is a must-have if you already play or plan on learning how to play a piano or keyboard.