Simulcast, shorthand for "simultaneous broadcast", refers to programs or events broadcast across more than one medium, or more than one service on the same medium, at the same time. For example, Absolute Radio is simulcast on both AM and on satellite radio, and the BBC's Prom concerts are often simulcast on both BBC Radio 3 and BBC Television. Another application is the transmission of the original-language soundtrack of movies or TV series over local or Internet radio, with the television broadcast having been dubbed into a local language.

Before stereo TV sound transmission was possible, simulcasting on TV and Radio was a method of effectively transmitting "stereo" sound to music TV broadcasts. In 1970 WPIX in Pittsburgh broadcast a live Boz Scaggs performance which had the audio simultaneously broadcast on two FM radio stations to create a quadrophonic sound, the first of its kind. The first such transmission was in 1974, when the BBC broadcast a recording of Van Morrison's London Rainbow Concert simultaneously on BBC2 TV and Radio 2 (see It's Too Late To Stop Now).

Samuel Lincoln "Sam" Seder (born November 28, 1966) is a comedian, writer, actor, film director, television producer-director, and talk radio host. Seder was born in New York City, New York into a Jewish family, and raised in Worcester, Massachusetts.

His works include the film Who’s the Caboose (1997) as well as the television shows Beat Cops (2001) and Pilot Season (2004). He also appeared in Next Stop Wonderland (1998). Seder also made guest appearances on Spin City (1997), Sex and the City (2000) and America Undercover (2005).

In March 2004, Seder became co-host along with Janeane Garofalo on Air America Radio's The Majority Report. In July 2006 Garofalo departed the show, offering positive comments about working with Seder. Seder was later offered a new contract with Air America Radio, and his show moved from the 7-10PM (Eastern) spot to a 9AM-Noon spot, retitled The Sam Seder Show.

On September 1, 2004, Sam Seder was briefly detained by the United States Secret Service during his live, on-site coverage of the Republican National Convention at Madison Square Garden. Shortly after Zell Miller gave his speech, Seder began searching (with a sign in hand) on the convention floor for a willing homosexual Republican to interview live on radio. It was not long before he was physically removed from the floor and after brief questioning, was asked (or according to some, "strongly encouraged") to leave the convention. Seder later commented that his wearing of a lapel pin that he had been given by a Secret Service agent at the Democratic National Convention earlier that year had kept him from being ejected from the convention completely.