  Hotboy (72 points) 
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To play the notes above C (referred to as the "altissimo" register), you need the following: 
 - a reed that is more resistant and open 
 - put more in the mouth 
 - bite down harder with the lips 
 - blow a lot harder 
 
If you still can't play in the altissimo register, best see an oboe teacher. 
 
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