‘Abdullah b. Mas’ûd – Allah be pleased with him – said:
“Singing sprouts hypocrisy (nifâq) in the heart as water sprouts greens and herbs.”
Ibn Battah, Al-Ibânah Al-Kubrâ Vol.2 p469, and Al-Bayhaqî, Al-Sunan Al-Kubrâ Vol. 52 p231.
Ibn Qayyim Al-Jawzîyah – Allah have mercy on him – said in Madârij Al-Sâlikîn, Vol.1 p487:
“These are the words of someone who fully understood singing and its effects, for no one regularly sings or listens to song except that his heart falls into nifâq without him realizing. If such a person understood the reality of nifâq and its end he would see it in his own heart. Never do the love of song and the love of Qur`ân come together in a person’s heart except that one expels the other. I and others have witnessed how heavy the Qur`ân feels to singers and song-listeners; how they coil when it is recited and how they get angry with a reciter when he recites too long for them (in prayer etc); and how their hearts do not benefit from what he recites: they are not moved to do anything by it. But when the Qur`ân of Shay tân comes, lâ ilâha illallâh! How they lower their voices and settle down! How their hearts feel at peace and how the crying and emotions start, how moved they are inwardly and outwardly and spend on clothing and perfume and staying up hoping for a long night ahead. If this is not nifâq then it is certainly the way to it and its foundation.”
Ibn Qayyim Al-Jawziyyah said in Ighaathat al-Lahfaan (1/224-225),
“From the deception of the enemy of Allah and the snares that he uses on those who are lacking in Islamic knowledge, sound intelligence and religion and by which he traps the hearts of the ignorant and the foolish is by listening to clapping, whistling, and singing to forbidden instruments that take the heart away from the Qur’aan and its teachings and make them addicted to sins and lewdness.
This is the Qur’aan (reciting) of shaytaan and he keeps one from the Qur’aan of Ar-Rahmaan. It is the chant of the homosexuals and the adulterers. Shaytaan is able to deceive the wrongful souls by it.
Shaytaan makes it look good to them by way of deception. He inspires them with false thoughts to consider it something good. They accept his guidance and as a result, the quran is neglected and abandoned.”