The Irish fiddle is one of the most important instruments in the traditional repertoire of Irish music. The fiddle itself is identical to the violin, however it is played differently in widely varying regional styles.
The melodion is a simpler version of accordion. The sound is produced by air that is blown inside by the movement of arms and that make vibrate metallic reeds inside. Depending on whether you compress or expand the bellows the note will be different.
Flutes of varied kind always has been played in traditional music for hundred years. The types used today are those simplest ones with 6 holes and even 8 keys. Usually they are made with wood. Their construction gives a dark sound and the much softer than the tin whistle
It's the most simple and economic of traditional instruments even if not that easy to manage. It's a simple metallic tube with 6 holes and a mouthpiece like the one of the recorder whose sound ranges between 2 octave.