North American Numbering Plan usually shown in capital letters, were dialed. Later, the third letter, where implemented, was replaced by a digit, or an extra digit was added. This generally happened after World War II, although New York City converted in 1930. The adoption of seven-digit local numbers (2L-5N) was chosen as the requirement for direct distance dialing and progressively deployed starting the late 1940s. The famous Glenn Miller tune "PEnnsylvania 6-5000" refers to telephone number PE6-5000, a number still in service at the Hotel Pennsylvania (212 736-5000) in New York. Similarly, the classic film "BUtterfield 8" is set in the East Side of
Glenn Miller where the Miller family briefly lived, as Glenn Miller Memorial Highway. Miller had a staff of arrangers who wrote originals like "String of Pearls" (written and arranged by Jerry Gray) or took originals like "In The Mood" (writing credit given to Joe Garland and arranged by Eddie Durham) and "Tuxedo Junction" (written by bandleader Erskine Hawkins and arranged by Jerry Gray) and arranged them for the Miller band to either record or broadcast. Glenn Miller's staff of arrangers in his civilian band, who handled the bulk of the work, were Jerry Gray (a former arranger for Artie Shaw), Bill Finegan