One balmy evening last summer, hundreds of ecstatic Muslim teenagers, many in headscarves, throbbed and swayed to the lyrics of Islamic pop singer Maher Zain at the sedate Garcia Lorca Theatre in Madrid’s working class suburb of Getafe. The Lebanese-born star sang mostly of peace and love in English and Arabic, and referred to ‘my brothers and sisters’ from Palestine, Morocco, Syria, but also Madrid and Barcelona.