“What differentiates between the lawful and the unlawful is (beating) the Daff and raising the voices (in song) at the time of marriage.” (Using translation from Ibn Mājah 1896)
قَالَ رَسُولُ اللَّهِ ﷺ «فَصْلُ مَا بَيْنَ الْحَلَالِ وَالْحَرَامِ الصَّوْتُ بِالدُّفِّ»