The partnership with Paul Whiteman led to Sack's hiring as the music director for the NBC Blue Network, where he worked on many shows including The Beulah Show and The Adventures of Maisie.
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It remained a fixture on the ABC radio network (formerly the NBC Blue Network; it became known as ABC in 1945), maintaining its popularity for years and counting among its fans Supreme Court Associate Justice William O. Douglas.
He was musical director of the War Production Board (WPB) series Three Thirds of a Nation, presented Wednesdays over the Blue Network.
In the 1930s and 1940s, the WNRI call letters were assigned to an NBC owned-and-operated shortwave station (originally W3XL) that transmitted from Bound Brook, New Jersey, a site it shared with NBC Blue-era WJZ.
The sounds of Brook Benton, Tommy Dorsey, Margaret Whiting, Doris Day, Frankie Laine and many others covered the east coast from Cape Cod to Cape Hattaras from October 1992 into 1993, emanating from an ancient General Electric transmitter of the type used by the venerable WJZ in its days as flagship of the NBC Blue Network.
They continued on NBC and the Blue Network, doing an evening series in 1936 with music by Ted Fio Rito.
With a title change to The General Motors Promenade Concerts, the program moved April 1937 to the Blue Network for a series of hour-long thematic shows with male/female leads, including one show of Victor Herbert music with Jan Peerce and Rose Bampton.
TraXX FM (formerly known as Blue Network, Radio 4 and Radio Malaysia Saluran 4 (English: Radio Malaysia Channel 4)) is an English radio station operated by Radio Televisyen Malaysia.