The structure of the nucleon through DIS hadron muoproduction at the COMPASS experiment.

 The COMPASS experiment at CERN is running since 2002. Its main goals are to improve our knowledge of the nucleon spin structure, using a polarized muon beam and a polarized target, and to contribute to hadron spectroscopy using hadron beams and searching for "exotic" hadrons with constituent gluons.
   After a short overview of the two stage spectrometer, I will describe the present results on the gluon polarization in the nucleon. The versatility of the COMPASS spectrometer can contribute much more to the knowledge of nucleon structure. Further studies will be presented for the present data and future possibilities.