Answer by taking a quote from the following article:

Patsy Cline (born Virginia Patterson Hensley; September 8, 1932 - March 5, 1963) was an American country music singer and part of the Nashville sound during the late 1950s and early 1960s. She successfully "crossed over" to pop music and was one of the most influential, successful, and acclaimed vocalists of the 20th century. She died at age 30 in the crash of a private airplane. Cline was known for her rich tone, emotionally expressive and bold contralto voice, and her role as a country music pioneer.

Patsy Cline was born Virginia Patterson Hensley on September 8, 1932 in Winchester, Virginia, in the city's Memorial Hospital. She was the eldest child of seamstress Hilda Virginia (nee Patterson, 1916-1998) and blacksmith Samuel Lawrence Hensley (1889-1956). She had a brother Samuel Jr. (1939-2004) and a sister Sylvia. The family moved often before finally settling in Winchester, Virginia when Patsy was 16. Sam Hensley deserted his family in 1947, but the children's home was reportedly happy nonetheless.  When Patsy was 13, she was hospitalized with a throat infection and rheumatic fever. She later said, "The fever affected my throat and when I recovered I had this booming voice like Kate Smith."  Cline enrolled at John Handley High School but never attended classes. To help her mother support their family, she worked as a soda jerk at Gaunt's Drug Store and a waitress at the Triangle Diner. She watched performers through the window at the local radio station, and she asked WINC (AM) disc jockey Jimmy McCoy if she could sing on his show. Her performance in 1947 was well received and she was asked back. This led to appearances at local nightclubs wearing fringed Western outfits that her mother made from Patsy's designs.  Cline performed in variety and talent shows in the Winchester and Tri-State areas, and she gained a large following through the shows and local radio appearances. Jimmy Dean was already a country star in 1954, and she became a regular with him on Connie B. Gay's Town and Country Jamboree radio show on WAVA (AM) in Arlington County, Virginia.

Why did she start singing?
she asked WINC (AM) disc jockey Jimmy McCoy if she could sing on his show.