What is mac-fuirmidh cittern?

Mac-Fuirmidh cittern is a type of stringed musical instrument that originated in Ireland during the 16th century. It is named after Domhnall Mac-Fuirmidh, an Irish harper who is believed to have invented this instrument. The Mac-Fuirmidh cittern has four courses of strings, with each course having two strings that are tuned in unison. The tuning of the cittern depends on the player's preference, but it is usually tuned in a high range. The Mac-Fuirmidh cittern is played by plucking the strings with a plectrum or fingerpicking. It has a bright and resonant sound that is often compared to the mandolin or the bouzouki. In modern times, the Mac-Fuirmidh cittern is still used in traditional Irish music, particularly in the music of County Clare.