Final answer:
Patsy Cline, Rosa Lee Carson, and Roba Stanley are significant first women in country music.
Explanation:
Patsy Cline, Rosa Lee Carson, and Roba Stanley are the most prominent first women in country music. Patsy Cline is known for her hits like "Crazy" and "I Fall to Pieces," Rosa Lee Carson was influential in the development of country music through her recordings, and Roba Stanley was one of the earliest female country music singers who recorded in the 1920s.
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