CAIRO — A video began circulating recently of a man and his veiled wife performing a song at a wedding party. The song includes such lyrics as “I don’t go to a place without performing ablution and prayers,” and has spread on social media with assurances that it was produced by an “Islamic” wedding band. My social media feed has recently become flooded with videos and ads on “Islamic” wedding bands, which typically included girls wearing satin dresses, as well as some with niqabs covering their faces. These bands insist that they are prepared to lead parties in line with God, and without mingl…