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In measures 1-8, the right hand is actually playing in octaves and filling in with chord tones at the same time. This is a common technique in piano, but it can be difficult if your hand isn’t used to stretching like that. Measures 50-57 should be practiced slowly at first and then gradually sped up. For this section, the left hand is written in the treble clef and does a lot of “filling in.” That means it plays mostly on the off beats and “fills in” the gaps of the right hand part.