Mar7aba kruseje;
We are open to add subjects and lessons that makes everyone happy,, but the problem with colloquial Arabic songs is they are so colloquial,, I mean you can't find any logic why these words are written like this and this is the reason we teach the classical Arabic as well as the standard colloquial one rather than teaching specific words that is used in certain area of certain country.
We've covered few songs where the lyrics is classical Arabic,, however,, if we come across something colloquial and we consider it to be standard colloquial that would benefit everyone,, they definitely we'll be more than happy to go for it

E