Prayer: Reciting Adhan and Iqamah in a Singing Manner
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 907
If adhan and iqamah are said in a manner that amounts to singing, i.e. in a manner that is in common with gatherings of entertainment and amusement, it is unlawful. If it does not amount to singing [but is somewhat similar to singing], it is disapproved.