The invention relates to a flute headjoint comprising a cylindrical pipe section (2), an embouchure hole (3) bounded by a reinforcing element (4), a crown (6) adapted to terminate the pipe section (2) situated to the left of the embouchure hole (3), and a concave tuning plug (8) disposed in the pipe section (2) in a sonic chamber (5) situated under the embouchure hole (3). The flute headjoint according to the invention is characterised in that the cylindrical pipe section (2) is longer compared to conventional configurations, the crown (6) is configured to be open, the tuning plug (8, 12, 15, 23) being a cylindrical body with its face situated facing the embouchure hole (3) having a sunken three-dimensional configuration made as a combination of regular or irregular arcuate and flat faces, and has a balance weight (40) adapted to be placed in the resonator cavity (5a) between the tuning plug (8, 12, 15, 23) and the crown (6), and also has an additional extension piece (42, 43).
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