Which hand should be on the top? LEFT. How do you avoid squeaking? Blow air less hard. Do I need to tongue? Yes, the tip of your tongue should tap the tip of the recorder.
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First Recorder Homework Assignment:
To be able to play "B" without squeaking.
To finger "B", be sure your LEFT hand is at the top of the recorder,
your thumb covering the hole in the back and
your pointer finger covering the first hole in the front of the recorder.