"Dancing," or difference in style, isn't a problem to me. The Ethiopians (and Eritreans I believe) do have a sort of "liturgical dance," and are very different in style from the Byzantine tradition. They are nonetheless Orthodox and not "low-church" or remotely evangelical in worship.
It's amazing to consider the ways that Orthodoxy can vary in expression depending on location. For across the vast continent of Africa, where there is Ancient Christianity, you find rhythmic movement along with it. In Ethiopia, Eritrea, Ghana, Kenya, South Africa, etc. The reasons for this are due to how this is the normal organic development of local Orthodox expression within African cultures - and it'd be wrong and not in keeping with Orthodox tradition to ask native cultures to abandon their customs that CAN be brought into Orthodoxy. Orthodox missionaries have never done that, unlike Western missionaries. African Christianity is truly a rhythmic culture on many levels..and it's beautiful seeing the ways dance/using the body for glorification of the Lord is accepted

African and Asian Orthodoxy is truly beautiful...
And with that comes the other reality of African Orthodoxy in the Diaspora - as it is amazing how it takes place in areas like the West Indies (
my beloved Jamaica being amazing in how worship chants go with the Rasta culture - with
them being very proud of their expressions as well when it comes to Orthodoxy). Of course, what occurs with African Orthodoxy varies from other groups. The way Indian Orthodox Church does things is similar to the Ethiopian when it comes to the use of drums - as
well as the ways their chanting style goes.
Easter procession St Thomas Church ATL
St.Thomas Day Procession, ATL
And then there's the fact that their style differs from The
Orthodox Church in Mexico (Chants all in Spanish

) and
Chinese Orthodox Byzantine Chant.
Orthodoxy from a global stance will vary on many things...
Some have said that the reality of diversity being present is why new expressions should be allowed/presented. In example, with the
Algonquin Canadians, it's interesting to see some of the suggestions others have brought up when it comes to showing their cultural perspective within Orthodox parishes - some suggesting that as Orthodox in America, they should develop unique chants/try to marry Orthodox worship and Native American chanting..

Some examples (abeit modern) on the point
I love
music (as well as the dance/use of drums ) from American Indian/Indigenious culture - as it's truly beautiful...and it's interesting to see others bring that into wherever they're at - just as other Ethiopian Orthodox have done in addition to others. One time, I was studying up on what another Orthodox minister remarked on in seeing the Orthodox Church as being a "bottom up" affair. In his view:
Throughout the history of the Church we see that the variou groups of people or tribes which were brought into the fold occured as a result of their entire culture being "baptised". This was tru when the Hebrew Apostles went out, first throughout the Middle East (as with Antioch where "we were first called Christians").
The process repeated itself when the Apostles spread out to the rest of the Mediterranian world to the Greco-Roman Culture. Then centuries later when Sts Cyril and Methodious went to the Slavic Tribes. They created an alphabet (based upon the Greek Alphabet), then the Russians went to Alaska in the 18th century and repeated the same tried and true process. Each with great success, one could argue that in Western Europe something different occured. They stopped teaching in the varnacular and continued Latin even through the Protestant Reformation. There was never any move to create a unique German, or French, or English Church. Not as a unified structure as occurred in Eastern Europe.
The individual, who is an Orthodox minister ( Rev. Archpriest Michael J. Oleksa, Th.D ), actully has a ministry on the issue for developing chants with Native America tones and ideas (as it concerns Alaskan Orthodox native chant, liturgy, culture) - which can be found if going
www.naocf.org /
Native American Orthodox Christian Fellowship . There was another similar one as well, although coming at things from a Polynesian perspective - as seen in
Orthodoxy and Hawaiian Culture. Beautiful work, IMHO
And all of it within the realm of being Orthodox.