also ahead: ♪ ♪ pianist rob kapilow returns to celebrate johannes brahms's birthday by breaking downone of the composer's most popular pieces. >> according to all contemporary accounts, he was sarcastic, prickly, abrupt, utterly self- guarded, almost impossible to get to know. and the same thing is actually true of this piece. >> woodruff: all that and more, on tonight's pbs newshour. >> major funding for the pbs newshour has been provided by: ♪ ♪ moving our economy for 160 years. bnsf, the engine that connects us. >> fathom travel-- carnival corporation's small ship line. offering seven-day cruises to three cities in cuba. exploring the culture, cuisine and historic sites through its people. more at fathom.org. >> lincoln financial-- committed to helping you take charge of your financial future. >> genentech. >> supporting social entrepreneurs and their solutions to the world's most pressing problems-- skollfoundation.org. >> the ford foundation. working with visionaries on the frontlines of social change worldwide. >> and with the ongoing support of these institutions: and friends