What is required for a transverse flute embouchure?

For a transverse flute embouchure, the correct requirement is that the player must blow air across the instrument body. This is essential because the transverse flute is played by positioning the flute sideways to the player's mouth. The air is directed across the hole of the flute, which creates the sound by vibrating the air inside the instrument.

This technique involves proper formation of the lips to create a controlled airstream that effectively interacts with the embouchure hole. Properly angling and positioning the flute allow for a beautiful tone quality and intonation.

In contrast, blowing air directly into the body of the flute would not create sound, as the mechanism of sound production relies on the air flowing across the hole. Pressing the mouthpiece firmly could restrict the airflow and create tension, which is counterproductive for sound production. Similarly, angling the flute upwards may affect the pitch but does not fundamentally relate to the technique required for achieving the correct embouchure.