Monitor was an American weekend radio program broadcast live and nationwide on the NBC Radio Network from June 12, 1955, until January 26, 1975. It began originally on Saturday morning at 8am and continued through the weekend until 12 midnight on Sunday. After the first few months, the full weekend broadcast was shortened when the midnight-to-dawn hours were dropped since few NBC stations carried it. The program offered a magazine-of-the-air mix of news, sports, comedy, variety, music, celebrity interviews and other short segments (along with records, usually of popular middle-of-the-road songs, especially in its later years). Its length and eclectic format were radical departures from the traditional radio programming structure of 30- and 60-minute programs and represented an ambitious attempt to respond to the rise of television as America's major home-entertainment medium. The show was the brainchild of Sylvester (Pat) Weaver, whose career bridged classic radio and television's infancy and who sought to keep radio alive in a television age. Believing that broadcasting could and should educate as well as entertain, Weaver fashioned a series to do both with some of the best-remembered and best-regarded names in broadcasting, entertainment, journalism, and literature taking part. Monitor and the Sunday-afternoon TV documentary series Wide Wide World were Weaver's last two major contributions to NBC, as he left the network within a year of Monitors premiere. Monitor Beacon The enduring audio signature of the show was the "Monitor Beacon" - a mix of audio-manipulated telephone tones and the sound of an oscillator emitting the Morse code signal for the letter "M", for "Monitor". It was described by one source as "a tape loop made from a sequence of 1950s AT&T telephone line switching tones generated by analog oscillators". The Beacon introduced the show and was used in transitions, for example, to station breaks, accompanied by the tag line: "You're on the Monitor beacon." Anchors and hosts When Monitor began on June 12, 1955 at 4pm, the first hour of the program was simulcast on NBC-TV. That initial June 12 broadcast lasted eight hours, from 4pm through 12 midnight. Following the Monitor beacon, Morgan Beatty was the first voice ever heard on Monitor. After an introduction by Pat Weaver, news headlines by Dave Garroway and a routine by Bob and Ray, Garroway cued Monitor'''s opening music remote: live jazz by Howard Rumsey and the Lighthouse All-Stars at the Lighthouse Café in Hermosa Beach, California.