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Electronic Roll-Up Piano 49 Key 4 Octave with Original Box and Instructions | eBay
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MODARTT expands pianos to 105 keys (8⅔ octaves) - Keyboards and Pianos - Harmony Central
This incredible piano has 108 keys and a nine-octave range – and it sounds immense - Classic FM
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What is an Octave in Music? | Piano Octaves & Octave Examples - Video & Lesson Transcript | Study.com
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The Piano Keyboard – Piano Music Theory
