The term "balladier" typically refers to a person who composes or sings ballads, but there are several different synonyms that can be used to describe someone who specializes in this kind of music. For example, you could use the term "minstrel" to describe a balladier, as this term is often used to refer to traveling musicians who perform traditional folk music. Alternatively, you might use the term "bard," which is often associated with ancient Celtic poetry and storytelling, and which can also be used to describe a musician who specializes in ballads. Other synonyms for balladier might include troubadour, minnesinger, or wandering minstrel.