Sunan an-Nasa'i 3369
سنن النسائي#3369HasanIt was narrated that Muhammad bin Hatib said:"The Messenger of Allah said: 'What differentiates between the lawful and the unlawful is the Duff, and the voice (singing) for the wedding
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahHasan
Al-AlbaniHasan
Zubair Ali ZaiHasan
In-book reference: 26:174