How do you write something like Partita for 8 Voices, the a cappella vocal piece that is this year's winner of the Pulitzer Prize for music?
"Very late at night," says the composer, Caroline Shaw, speaking with NPR's Scott Simon. "Sometimes it comes from having a sound in your head that you really want to hear, that you've never heard before, and struggling to make that sound happen in any way you can."
People who knew Dzhokhar Tsarnaev just have a hard time squaring the man they knew, with the violence in Boston. Sierra Schwartz went to Cambridge Rindge and Latin high school with the suspect, who's now in custody.
SIERRA SCHWARTZ: The Dzhokhar that I knew at the time was friendly, quiet but not in a - alarming way. He was just - you know, soft-spoken but very - you know, funny, very sweet, wouldn't harm a fly; someone that you would want to talk to.
Tracing the Tsarnaev family roots back to Russia is going to require cooperation between Washington, D.C., and Moscow and of course, as we just heard, this comes at a frosty time in relations between the two countries. NPR's diplomatic correspondent Michele Kelemen joins us. Thanks for being with us.
MICHELE KELEMEN, BYLINE: Thanks, Scott.
SIMON: And first, any signs of cooperation so far?
Soon after federal authorities disclosed that the suspects in the Boston Marathon bombings were Muslims of Chechen descent, many American Muslims began bracing for a backlash. NPR's Jennifer Ludden has more.
Back now to our coverage of the tense night and police activity that brought an end to the manhunt for the second Boston Marathon bombing suspect. Franklin Street in Watertown was the epicenter of that massive search. Police and SWAT teams took over the suburban neighborhood looking for 19-year-old Dzhokhar Tsarnaev. Keith Glavish lives nearby. He was in his house while the search unfolded. Thanks for being with us.
Numbers are down at the American International School in Bamako, the capital of Mali.
In just over a year, the country has witnessed a rebellion, a military coup and the occupation by Islamist fighters of the desert northern region, recently largely liberated in a counteroffensive by French-led forces. Despite the troubles, the school is open and classes continue.
Teacher Paul Chandler is taking his combined class of 6th- and 7th-graders through their early paces, learning the Malian music they'll be performing at the annual school concert.
The Boston Marathon bombing suspects are ethnic Chechens with links to the volatile North Caucasus region of Russia. Moscow's reaction to that fact appears to be as complex as the region's turbulent history.
Some stories stand the test of time: Shakespeare's plays, the fairy tales of the Brothers Grimm, and the Child ballads.
If you're unfamiliar with them, they're not for children. They're Scottish and English folk songs from the 17th and 18th centuries and earlier. They're named after Francis James Child, the Harvard professor and folklorist who collected them.
Boston will be closed on Monday - more or less - for the 117th Boston Marathon. It's the Super Bowl for serious runners. For more, we turn now to running coach and marathon man Tom Derderian. He's the author of "Boston Marathon: The First Century of the World's Premier Running Event," and "The Boston Marathon: A Century of Blood, Sweat and Cheer." Tom, thanks for being with us.
TOM DERDERIAN: A pleasure to be with you.
SIMON: Tom, may I put you on the spot and ask what your best time - ever - was?
This is WEEKEND EDITION from NPR News. I'm Scott Simon, and I wait all week to say: It's time for sports.
(SOUNDBITE OF THEME MUSIC)
SIMON: The serene and pristine fairways of Augusta have been trampled up and down for a couple of full days now. The Masters tournament is halfway through. NPR's Tom Goldman has been there watching, not playing. Thanks for being with us, Tom.
TOM GOLDMAN, BYLINE: But trampling, Scott - I've done my fair share.