All Things Considered is the most listened-to, afternoon drive-time, news radio program in the country. Every weekday the two-hour show is hosted by Audie Cornish, Kelly McEvers, Ari Shapiro, and Robert Siegel. In 1977, ATC expanded to seven days a week with a one-hour show on Saturdays and Sundays, which is hosted by Michel Martin. During each broadcast, stories and reports come to listeners from NPR reporters and correspondents based throughout the United States and the world. The hosts interview newsmakers and contribute their own reporting. Rounding out the mix are the disparate voices of a variety of commentators.