It’s no joke, the better your posture is, the better your playing will sound. Good posture allows you to use your full body when sitting at the keys, which will create a fuller, richer sound.
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Keep your back and neck straight and in alignment. It may help you improve slouching if you set up a mirror to the side of your keyboard.
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You should be sitting high enough that your elbow and upper arm hang freely from your shoulder with your forearm parallel to the floor.
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Adjust your distance from the keyboard so that your elbows are a little in front of the center line of your body when playing.