bubudi wrote:certainly there's a lot to middle eastern music that we aren't often exposed to in the west. the more popular genres however, don't have the same complexity and subtlety as the classical repertoire.
Not necessarily true, b. Honest!
i also find that timings such as 5s, 7s and 9s are disappearing from the folk music of many arab countries, although they remain common enough in the balkans.
Again... not necessarily true. Am wondering where you've seen/heard this happening?
I do think a detailed discussion of rhythms (and shifts/changes in their use) is best left to the people who play *really* well, and know far more than I do, to discuss. (Yusif Sheronick and Ali Jihad Racy for example.) In Turkey, the "odd meters" are still very important, also - AFAIK - on the Arabian Peninsula, both in Saudi Arabia and some of the Gulf states. There's an infusion of East African music in the music of much of the Arabian Peninsula (largely due to the slave trade, but also due to ongoing wars between various E. African countries and the Sultanate of Oman; Oman controlled large parts of the NE African coast at various times) + constant "new" musical influences moving from E. Africa and the Arabian Pensinsula to India (and back again) - from both trade (dhows, now freighters) and immigration. Jihad Racy and his wife Barbara are excellent sources on this; so is Phil Schuyler, who now teaches at U. Washington (in Seattle). He's spent years on Yemeni music, also on the Gnawa and various Sufi orders in Morocco.
(Kinda parenthetically, I have a "basement tape" of music from a wedding reception party - the women's party, that is - from Saudi Arabia, and they're playing polyrhythms on several frame drums. The patterns are fairly simple, but still... it's clearly African-influenced music, and very different than anything you'll hear in Lebanon, Syria or Israel...)
I think (maybe?) you're confusing pop music - like raï and jeel - with a "flattening out" of distinctive local styles of music (including rhythms). Even Egypt is really quite diverse, in terms of ethnic groups and distinctly "ocal/regional styles of music. (Check what happens in Port Said, for example - much different than in the rest of the country.)
am also wondering if you might be thinking of cabaret-style drumming (for dance routines) as opposed to the more folkloric forms in all of the Arab N. African countries? There's a big difference, in that the cabaret/dance accompaniment style is a bit more "universal" (partly due to the popularity of Egyptian movie musicals from the 40s-70s). But that *still* doesn't have much to do with local dances, local rhythms, and local/regional styles of both pop and folk/"roots" music. (I really don't like using those last several terms here, but can't think of good analogues at the moment.) There's also - definitely - a need to use simpler, more straightforward rhythms and combinations of rhythms in accompanying less experienced dancers. (Though - from what little I know of that - it seems to be much more the case with dancers who didn't grow up with the music... Happens a lot here, in the US.)
There are also distinct rhythms in Algeria and Tunisia (not just Morocco) that come from sub-Saharan Africans who either came due to the slave trade or for other reasons. (As free people, not slaves.) It's very complex stuff on the whole. I do know of some Western dancers who have spent time in past decades collecting as many rhythms as possible in both of those countries as well as in Morocco. These are quite distinct from those played in Egypt and the ME, and definitely have a strong sub-Saharan African influence as well as Berber component. (And some of them *are* Berber rhythms - but even there, there is a lot of regional and local variation.)
You can also check David Kuckhermann's YouTube vids for a great multi-part instructional session (on bendir, riqq and darbuka) on some "new" (to us) Tunisian rhythms (all pretty complex!) and Tunisian riqq technique - the latter virtually unknown outside of Tunisia ('til now).
As for countries like Iraq - well, it's got its own highly distinctive musical traditions (even percussion instruments that aren't played anywhere else in the Arab world) as well as musical styles (folkloric, classical and popular) that are quite distinct. I've got some examples on my blog (link is in my signature.) Again, there's *lots* of regional stuff, plus influence from Iran, and... I'm not the person to explain this; should ask the guy who makes my tablas and frame drums for some sources, as he's Baghdadi and a master drummer. (Has lived in the US for over 20 years now.) the upper Midwest - especially southeastern Michigan - is a *great* area for this, with so many iraqi immigrants (going back decades and decades; the Detroit area has the largest Arab American population in the US).
Here in the US - in the NYC area and in California in particular - there is also a strong contingent of Armenian immigrants who are part of the Middle Eastern music and dance scene, and they bring their own regional styles to the mix.