Spade Cooley's Western Swing Song Folio

Spade Cooley's Western Swing Song Folio was the first songbook to identify the big Western dance band music as Western Swing. In October 1944, "Billboard made the following announcement, unceremoniously giving the subgenre its common label for the first time in a national publication: 'Spade Cooley will put out 25 of his original tunes, together with an album of band numbers and suggestions on arrangements for Western Bands.

Source: Wikipedia — Spade Cooley's Western Swing Song Folio (CC BY-SA 4.0)