Shaikh Fakhruddin Zarradi a senior khalifa of Mehboob e Ilahi Shaikh Nizamuddin Dehlawi (Allah have mercy on them, d. 725Hijri/1325CE) writes,

‘Few of the spiritually overwhelmed (maglub) Shuyukh may have listened to the audition (sama’) accompanied with musical instruments in their state of overpowering desire (shauq). However, our mashaikh (may Allah be pleased with them) are free of this. It is an allegation. Their audition was purely vocal rendition of verses by a reciter (qawwal) describing the perfections of Allah’s creation.’

Usool e sama’, page 21-2