Obama was on ABC's Nightline last night and elucidated further.
He was asked if black patriotism and white patriotism was different and if so how and he used music as a metaphor. That perhaps white patriotism was like a John Philip Sousa while black patriotism was more like a jazz tune and some blue notes. You can watch here. And read more of Obama's interview with ABC news here.
He brought to mind another thing I read he said (I can't find where, having spent about 15 minutes trying). Speaking of the march in Selma to Montegomery march and Bloody Sunday, some one said to Obama that that event was a great moment in African-American history and Obama said no, it was a great moment in American history.