A single singer would have a little concertina-type instrument and a one-string fiddle and a triangle, those were the instruments, but they would always have a singer and of course they sang in Cajun.
In the context of traditional Cajun music, a solo artist typically played a limited set of instruments, such as a small concertina, a single-stringed fiddle, and a triangle. However, their performances were always augmented by a vocalist, who sang in the unique Cajun dialect.