Sayyiduna Fadalah bin Ubayd al-Ansari (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Allah listens more attentively to a man 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 / 21051