Is it permissible to design a website for selling music discs and to assist its owner in publishing and promoting it?

Singing and music are forbidden, and if Allah forbids something, He also forbids its price, based on the Prophet's (peace be upon him) saying: "There will be people from my Ummah who will legitimize illegal sexual intercourse, silk, alcoholic drinks, and musical instruments." It is not permissible to assist in forbidden acts, as Allah Almighty says: "And cooperate not in sin and aggression." One must seek lawful and good earnings and avoid forbidden work, because money resulting from creating forbidden websites is considered unlawful money and ill-gotten gain, and the Prophet (peace be upon him) said: "No flesh nourished from ill-gotten gain will enter Paradise; rather, the Fire is more befitting for it."