Terry Gross

Since 2006, more than 60,000 of the weapons used in Mexican crimes have been traced back to the United States. Washington Post investigative reporter James Grimaldi explains how a team of reporters uncovered the names of the top 12 U.S. dealers of guns traced to Mexico.

Guitarist and composer Marc Ribot's latest album, Silent Movies, pays tribute to film scores. The creation of the album, he says, allowed him to express his more lyrical side.

Composer Allen Shawn's twin sister, Mary, was diagnosed with autism and sent to an institution when they were 8 years old. He writes about his relationship with Mary — and his feelings of survivor's guilt — in a new memoir, Twin.