Sayyiduna Fadalah (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "Allah listens more attentively to one with a beautiful voice reciting the Qur'an than the owner of a singing slave-girl listens to his singing girl."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21052