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The perception that the piano is the hardest instrument to learn may be due to a few reasons. First, it has a wide range of notes—7 and a half octaves, making it larger and more complex than many other instruments. Second, it requires playing multiple notes at once with both hands, which can be challenging to coordinate. Third, it demands a high level of technical skill and precision, including accuracy in fingering and articulation. Finally, learning to read and play the complexities of written music on the piano takes time, patience, and consistent practice.