Sayyiduna Fadalah bin Ubayd (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "Allah Almighty 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 slave-girl."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15863