The Sound of History: B-25 Mitchell in motion at the National Museum Of World War II Aviation. In 1939, the U.S. Army Air Corps ordered a new class of “medium” bomber: a twin-engine plane capable of flying 300 mph, carrying a 3,000-pound bomb load, and reaching a 2,000-mile range. Four aircraft manufacturers submitted designs. The Army selected both Martin's B-26 and North American's B-25. North American Aviation called the bomber "Billy Mitchell" in honor of the controversial general who strong

“Don't it always seem to go That you don't know what you got 'til it's gone?” Settle into the week with Joni's "Big Yellow Taxi," performed at the BBC Television Centre 53 years ago this month. | Joni Mitchell