It is narrated from Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The price of a singing slave girl is unlawful, her singing is unlawful, looking at her is unlawful, her price is like the price of a dog, and the price of a dog is also unlawful. And whoever's flesh has grown from unlawful wealth, the Fire is more deserving of him."
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 86