kamagra à quoi ça sert This is the main form of entertainment. Traditional music sessions both organised and impromptu are held in the pubs on the islands. Classes in all instruments are also available during the winter. Set and Céilí dancing is also done. Sean Nós singing( that is old style solo and unaccompanied) is one of the most ancient form of traditional singing in the western world. It is the most popular form of singing on the islands and is widely performed.