From Wikipedia:
Musical Merry-Go-Round was a NBC TV series which aired from 1947 to 1949. The series featured live music performances. Each 30 minute episode was hosted by Jack Kilty. Little else is known about this early television series.
Musical Merry-Go-Round was an innovative early TV pioneering effort to do music videos. It was re-named from predecessor groundbreaking series called Disc Magic. Ray Bloch, the orchestra leader, was host as one of the emcees featuring musical performances.
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