Standard was one of the largest producers of Electrical Transcriptions ("canned music") for radio stations and released these special unnumbered recordings (which were decidedly not licensed for broadcast) for the diversion of its major subscribers. Late 1930's and early 1940's releases were recorded using RCA Victor's Hollywood matrix series. Labels are white with a red and blue stripe and blue printing. Standard severed the connection when RCA joined CBS in holding out against the striking American Federation of Musicians. Issues from 1943 onward were recorded at a variety of West Coast studios and show their respective matrix numbers.