 It became a powerful symbol of the opposition to the communist regime in the People's Republic of Poland and was sung at countless rallies, meetings, protests and strikes throughout Poland during the 1980s.The lyrics for "Mury" were written in 1978 to the melody of the song "L'Estaca" by the Catalan singer Lluís Llach, which Kaczmarski heard on one of several Spanish records he borrowed from a friend in December of that year.The intention of Kaczmarski's lyrics was to examine how a song or poem can cease to become the 'property' of the author after it is 'stolen' by the masses, who may appropriate it for a particular cause even if it wasn't the author's intention in the first place.