First off, I think it would be wise to wait for the next part of the article before drawing conclusions.
there are *so* many things involved here - racism is one, but only one. I am white, and have only been studying Guinea and Mali-style drumming for 1 year. I feel very fortunate to be learning in a situation where the drum/dance scene is very much mixed-race. (The majority of the dancers are African American, but there are white, Asian and Latino dancers; the situation with the drummers is similar.)
To me, one of the single most important things to do is to come to the music and dance with an attitude of respect and humility. If your heart and mind are open - in terms of learning from others who don't necessarily come from the same background as you (whether that is ethnic, national... whatever), there will be acceptance, though it might not come quickly (from some folks, at least).
As for the description of older generations here in the US feeling that African drum/dance culture is theirs - it makes complete sense to me. People here have been through
very difficult times, and even though I am an "outsider," I can see some of the reasons for wanting to identify so closely with West African culture, as a new identity that confers self-respect, dignity, and an appreciation for "roots." It does follow, i think, that many of the older African Americans who have been involved in drum and dance would feel a proprietary interest.
it's important that we actually *talk* about these things, because there are ongoing, deep hurts in the black community (and far beyond) that need to be salved. And I honestly do believe that many of us in the US are extremely casual about other peoples and their cultures - to the point that many don't want to learn much (if anything) about traditions because they think they can use the instruments however they want. (For my part, I believe that a good background in West African music and dance makes one's "vocabulary" much larger - and that being deeply grounded in tradition enables one to be able to create something new.)
and - to be very honest - I doubt many white Americans have had African American teachers (in any subject, not just music and dance). I believe that the statements in the article re. some white students somehow thinking that they can understand and articulate things better than their black colleagues is - sadly - the truth, and indicative of much deeper problems in our society.
It is going to take time to work these things through - on a personal level, and on a national level. but I do hope that those who have a sincere desire to learn, and a real love for African music and dance, will be able to work together to celebrate it - and the cultures from which it has come - regardless of skin color, ethnic background, etc. (I will also say that I would feel very odd if i were in an all-white group of drummers and dancers, unless i lived in the Yukon!

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* Also - if anyone wishes to learn more about race and the US, please check out Senator Barack Obama's speech
http://www.youtube.com/watch?v=pWe7wTVbLUU (given in Philadelphia 2 weeks ago). I am not posting this for political reasons, but because he is so eloquent about what we are facig, and about the need for understanding, compassion and change.
All the best to you!
e2c