There may be many reasons. First of all, please check if your reed is correct, if it is wet and without any major chips or cracks. Then, make sure your lower lip is above your teeth when playing (your lower teeth should never touch the reeds). Also, try to reduce the mouthpiece when playing. Sometimes, too many cigarette holders can cause a squeak. Finally, if all these methods fail to solve the problem, then your saxophone may need maintenance by maintenance personnel!
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