A Radio station with the call letters '5XT" in the state of Oklahoma in the year 1928 had this programing experience.......(The link for the whole article is found below)

One of 5XT's notable early programs was a concert by the nationally prominent singer Alma Gluck, who is remembered for having had the very first million-selling record with her version of James Bland's "Carry Me Back To Old Virginny." Gluck's concert was a much-publicized event for Oklahoma City society, and the Daily Oklahoman's society pages carried numerous announcements heralding her upcoming concert.

Although [Earl Clemett] Hull [staion's manager and owner] had received permission from the concert's promoter to broadcast Gluck's performance, he had failed to seek permission from the star. It did not occur to Hull that Miss Gluck would have any objection to her performance being broadcast on his radio station and gamely set up his radio equipment, hanging a microphone over the stage. Unknown to Hull, Gluck was hardly a fan of radio; in fact, she believed radio was directly responsible for her recent lackluster record sales. When Gluck learned of Hull's plans to broadcast her performance, she refused to perform unless her manager stopped the impending radio broadcast.

Gluck's manager believed he had carried out the diva's wishes simply by cutting the wires of the microphone, sending it crashing down to the stage floor. The senseless gesture on the part of Gluck's manager made Hull murderously angry, and the ensuing argument between the two barely escaped coming to blows. However, Hull was not easily swayed from his mission. A remote broadcast was a time-consuming event, requiring the complete disassembly of the radio station, then reassembly at the remote site; Hull was not about to leave the auditorium without giving his listeners the promised broadcast. While the argument was raging, an assistant of Hull managed to conceal a microphone behind the curtains on the stage. Despite Gluck's objections to being broadcast, Hull succeeded in presenting her concert to the Oklahoma City radio audience.

The Alma Gluck .... broadcasts, had been successful in publicizing 5XT. The publicity from these broadcasts led to profits for the Oklahoma Radio Shop and allowed Hull and Richards to invest the princely sum of $3,000 to enlarge their experimental station to a full-time commercial venture. They applied for and received a Class A commercial radio operator's license and were assigned the call letters WKY.

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