What is the ruling on religious anasheed (chanted poetry) with and without the daff (tambourine), and is bad breath an excuse for missing congregational prayer?

There is no harm in listening to religious anthems, whether accompanied by a drum (daf) or not. As for someone whose mouth odor (halitosis) harms those praying, he is prohibited from praying in the mosque with the congregation, just like someone who has eaten garlic or onions.