Music instruments that were (and are still) most commonly used in Breton music were bombard, biniou (breton bagpipe), treujenn gaol, (actually a clarinet), accordion.
More recently (i.e. in the 70’s and after World War II), new instruments like guitars, Irish wooden flute, bass, violin, Scottish bagpipes were introduced.
In Astrakan Project, I mostly play stringed instruments. You may have noticed that I use guitar, but also Turkish ‘ud and bağlama (commonly called saz in western Europe). One may think this is to give an oriental flavour to our music. This might be partly true, but I don’t think this is the main reason.
One good reason is of course the fact that we currently live in Turkey, where ‘ud and bağlama are commonly used, so why shouldn’t I use them, temptation is so huge ?
But another good reason is that these instruments enables to play “more notes”, including the so called “commas“. In Breton music, we do have “commas” (see here for further explanations, for musicologists only !), yes, but they tend to disappear with the introduction of guitar, accordion and Scottish bagpipes for instance. You can play any note you want on a ‘ud, and almost any on a bağlama (even if there are frets).
When I play a breton tune, I feel closer to the truth (?) when I use the ‘ud than when I use the guitar, I think that’s a good reason for using oriental instruments !