What is "nacash"

Nacash (sometimes Brothers Nacash or Les Frères Nacash) is a singing group based in France singing French variety songs and world music. The band is composed of five brothers, sons of Algerian Jewish Cheikh Alexandre Nakache, a master of Andalusian classical music who immigrated to France in 1962 with his family. The band released albums and singles spanning from the 1980s to presently with the single "Elle imagine" written as a tribute to their sister, becoming their biggest hit.