Troubadours were traveling musicians. They were a little different in that not all of their music or poetry was religious. They preformed for the nobles at feasts and for everyone at tournaments and festivals. Some of their music was unusual because they sang about real people, love stories, and heroes.
Troubadours idealized knights and their quests in song, and real knights hearing their music seemed to want to be like the heroes of the music. This promoted the rise of chivalry and manners.
Since the troubadours' music was not religious it was not written, down so most of their music has been lost forever.