| Two violinists, a cellist and a viola player were aboard a flight that was delayed for three hours on the tarmac in Beijing on Friday. They took out their instruments and played an impromptu concert for the appreciative 
	-- if captive -- audience. Several passengers whipped out smartphones and began recording as the orchestra played a selection from Dvorak's "American" string quartet. The instrumentalists were greeted with cheers and applause as they wrapped up their 
	5 1/2-minute performance. A video of the quickie concert was posted online. The ensemble recently launched a tour of China, 40 years after it became the first U.S. orchestra to visit the country. ___ Online: Video of concert aboard plane:http://bit.ly/195BrrC
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