Generally, the shows are organized into segments, each separated by a pause for advertisements; however, in public or non-commercial radio, music is sometimes played in place of commercials to separate the program segments. Many political radio talk show hosts use music rather than commercials, because the controversial nature of their program often deters advertisers. Variations of talk radio include conservative talk, hot talk, liberal talk and sports talk.

Starting around 2005, the technology for Internet-based talk-radio shows became cost effective. Now, it is possible for an individual to use a variety of services to host an Internet-based talk-radio show without investing any of their own capital.

Expressing and debating political opinions has been a staple of radio since the medium's infancy. Aimee Semple McPherson began her radio broadcasts in the early 1920s and even purchased her own station, KFSG which went on the air in February 1924; by the mid-1930s, controversial radio priest Father Charles Coughlin's radio broadcasts were reaching millions per week. There was also a national current events forum called America's Town Meeting of the Air which broadcast once a week starting in 1935. It featured panel discussions from some of the biggest newsmakers and was among the first shows to allow audience participation: members of the studio audience could question the guests or even heckle them.

Talk radio as a listener-participation format has existed since at least the mid-1940s. Working for New York's WMCA in 1945, Barry Gray was bored with playing music and put a telephone receiver up to his microphone to talk with bandleader Woody Herman. Soon followed by listener call-ins, this is often credited as the first instance of talk radio, and Gray is often billed as "The hot mama of Talk Radio."

Author Bill Cherry proposed George Roy Clough as the first to invite listeners to argue politics on a call-in radio show at KLUF, his station in Galveston, Texas, as a way to bring his own political views into listeners' homes. (He later became mayor of Galveston.) Cherry gives no specific date, but the context of events and history of the station would seem to place it also in the 1940s, perhaps earlier. The format was the classic mode in which the announcer gave the topic for that day, and listeners called in to debate the issue.

5. Peace Revolution:

http://peacerevolution.podomatic.com/

6. Christian Perspectives:

http://issuesineducation.org/index.asp