The Bailey Brothers and the Happy Valley Boys were an American bluegrass act widely considered to be among the first to cultivate the duo harmony vocal technique widely used in modern bluegrass music today.
 Charlie Bailey (February 11, 1916 in Happy Valley, Tennessee, near Rogersville – March 12, 2004 in Bear, Delaware) began his musical career in 1936.
 His brother, Danny Bailey (December 1, 1919, Happy Valley, Tennessee – March 22, 2004, Knoxville, Tennessee), teamed up with him in 1940, and the brothers began making frequent appearances on Tennessee radio stations in the Knoxville area.
 Danny formed the Happy Valley Boys after Charlie joined the military in 1941.
 In 1944 the Happy Valley Boys relocated to Nashville, where they became members of the Grand Ole Opry, and also made regular appearances on WSM radio in Nashville.
 At that time, Danny was the youngest person to ever perform on the Grand Ole Opry.
 When Charlie returned from his military service in 1946 the brothers were reunited as a duo but only stayed in Nashville briefly before returning to radio work in Knoxville.
Keith Bilbrey (born August 14, 1952) is an American country music disc jockey and television host in Nashville, Tennessee.
 He served as a disc jockey at Nashville's WSM, as an announcer on the Grand Ole Opry, and as the host of TNN’s Grand Ole Opry Live.
Bradley Gaskin (born in Gadsden, Alabama) is an American country music singer-songwriter.
 He signed with Columbia Nashville in 2011 and has released his debut single, "Mr. Bartender" after being discovered through a talent contest sponsored by John Rich.
 At the time, Gaskin had been working for his father hanging sheetrock.
 The song entered the Hot Country Songs charts at number 51 on the chart dated for the week ending April 2, 2011.
 He made his Grand Ole Opry debut on August 20th, 2011.
 After a corporate restructuring, Gaskin moved to Columbia Records to release his second single, "Diamonds Make Babies".
 On June 4, 2012, it was announced that Sony Nashville was retiring the BNA label and moving its roster to Columbia Nashville.
 Gaskin was dropped from the label following this move.
 Gaskin spent much of 2012 touring with Big & Rich, typically performing "Mr. Bartender" as well as a cover of Keith Whitley's "Don't Close Your Eyes".
 Gaskin had plans for releasing a version of the Keith Whitley song prior to the problems that arose with his label.
 Gaskin wrote a Tate Stevens "Power of a Love Song" in 2013.
 Bradley performed "Don't Close Your Eyes" during a Grand Ole Opry performance on October 30, 2015.
Crystal Gayle (born Brenda Gail Webb; January 9, 1951) is an American country music singer.
 Best known for her 1977 country-pop crossover hit song, "Don't It Make My Brown Eyes Blue", she had twenty #1 country hits during the 1970s and 1980s (18 on "Billboard" and 2 on "Cashbox") and six albums certified gold by the Recording Industry Association of America.
 Gayle became the first female artist in country music history to reach platinum sales, with her 1977 album "We Must Believe in Magic".
 Also noted for her nearly floor-length hair, she was voted one of the 50 most beautiful people in the world by "People" magazine in 1983.
 She is the younger sister of the country singer-songwriter Loretta Lynn and the singer Peggy Sue and a distant cousin of singer Patty Loveless.
 Gayle is a member of the Grand Ole Opry and has a star on the Hollywood Walk of Fame, near Lynn's star.
Ryman Auditorium (formerly Grand Ole Opry House and Union Gospel Tabernacle) is a 2,362-seat live performance venue, located at 116 5th Avenue North, in Nashville, Tennessee and is best known as the home of the "Grand Ole Opry" from 1943 to 1974.
 It is owned and operated by Ryman Hospitality Properties, Inc.
4 Star Records was a record label that recorded many well-known country music acts in the 1950s.
 The label, founded after World War II, was home to singers such as Hank Locklin, Maddox Brothers and Rose, Rose Maddox, Webb Pierce, Cousin Ford Lewis and T. Texas Tyler, who all regularly issued records on the label, mostly as 78rpm singles.
Johnny Paycheck (born Donald Eugene Lytle; May 31, 1938 – February 19, 2003) was an American country music singer-songwriter, multi-instrumentalist, and Grand Ole Opry member notable for recording the David Allan Coe song "Take This Job and Shove It".
 He achieved his greatest success in the 1970s as a force in country music's "Outlaw Movement" popularized by artists Coe, Waylon Jennings, Willie Nelson, Billy Joe Shaver, and Merle Haggard.
 In the 1980s, his music career slowed due to drug, alcohol and legal problems.
 He served a prison sentence in the early 1990s and his declining health effectively ended his career in early 2000.
 In 1980, Paycheck appeared on the PBS music program "Austin City Limits" (season 5).
The Country Music Greats Radio Show, now branded as the Pure American Country Radio Show, is a syndicated radio program recorded in Nashville, Tennessee.
 The show began in 2003 and has steadily grown, covering the United States with nearly 200 affiliate stations.
 The "Country Music Greats Radio Show" was hosted by Grand Ole Opry legend Jim Ed Brown from its inception until shortly before his death in 2015.
 Since Brown's death, Bill Cody has hosted the now-rebranded program.
 Brown’s 50 plus years in the music business provided inside knowledge and first-hand accounts of the legends of country music.
Lawrence Hankins 'Hank' Locklin (February 15, 1918 – March 8, 2009) was an American country music singer-songwriter.
 A member of the Grand Ole Opry for nearly 50 years, Locklin had a long recording career with RCA Victor, and scored big hits with "Please Help Me, I'm Falling", "Send Me the Pillow You Dream On" and "Geisha Girl" from 1957-1960.
 His singles charted from 1949-1971.
James Cecil Dickens (December 19, 1920 – January 2, 2015), better known by his stage name, Little Jimmy Dickens, was an American country music singer and songwriter famous for his humorous novelty songs, his small size (4'11" [150 cm]), and his rhinestone-studded outfits (which he is given credit for introducing into country music live performances).
 He started as a member of the Grand Ole Opry in 1948 and was inducted into the Country Music Hall of Fame in 1983.
 Before his death he was the oldest living member of the Grand Ole Opry.

Question: 4 Star Records was a record label that was home to what American country music singer-songwriter who was a member of the Grand Ole Opry for nearly 50 years?
Answer: Lawrence Hankins 'Hank' Locklin