What does the trumpet represent in the film, La strada?

In the beginning, the trumpet represents Gelsomina's incompetence, but by the end of the film, the trumpet represents her one triumph. She does not learn everything about life, but she does learn to play the trumpet; the trumpet turns out to be Gelsomina's one link to her former happiness and innocence which we learn from the woman who says that Gelsomina played the trumpet for her family when she was happy.