I mentioned to a friend that I'd gotten a Thierry Robin and Erik Marchan album that combined traditional Breton Celtic music with oud.

He replied that years ago he'd had an album of "Breton folk singing, but backed with a single-string musical instrument, really minimalist." I know a little bit about Breton music, but can't think what he possibly means. Is there _any_ single string musical instrument in Celtic France? The Basque region has the multi-string "tamborin a cordes" that's pretty minimal, but that's multi-string and the southwest.

Anyone have any idea what my friend may be referring to, or is he misrecalling and thinking of some just minimalist Breton music with mandolin/guitar/epinette/oud?