Can I learn with the Alexander Technque to release the muscles of the larynx in singing ?

The application of the principles of the Alexander Technique in the various activities of daily life will teach you how to release the throat during any activity and how to apply it then in singing, which is only a specific application of the use of oneself.

Is the Alexander Technique beneficial for singers?

The Alexander Technique is well known for its benefits for the voice.
Its application brings an adjustment of the vocal apparatus which makes changes and improvements easier and brings the voice under better control. Singing teachers often send pupils for Alexander Technique lessons in order to improve their breathing, posture, voice, to learn to deal with stress and the conditons necessary to face change and corrections.