Question: When was the American singer and musician born who was also the client of Vern Yocum?

full_context: Document 1: Red Foley: Clyde Julian Foley (June 17, 1910 – September 19, 1968), known professionally as Red Foley, was an American singer, musician, and radio and TV personality who made a major contribution to the growth of country music after World War II.
Document 2: Buddy Kaye: Jules Leonard "Buddy" Kaye (January 3, 1918 New York City - November 21, 2002 Rancho Mirage, California) was an American award-winning songwriter, musician, producer, author and publisher. His songs were recorded by top performers, including Frank Sinatra, Bob Dylan,Sarah Vaughan, Dinah Washington, Ella Fitzgerald, Perry Como, Elvis Presley, Cliff Richard and Dusty Springfield. He scored number 1 hits on the Billboard charts in 1945 with "Till The End Of Time", recorded by Perry Como, and in 1949 with "'A' You're Adorable (The Alphabet Song)", recorded by Como and the Fontaine Sisters. Among his most recognizable tunes in pop culture is the co-written theme song to the television series "I Dream of Jeannie". In 1975, he won a Grammy Award for best children's album for his production of "The Little Prince," read by Richard Burton.
Document 3: Frank Sinatra: Francis Albert Sinatra ( ; ] ; December 12, 1915 – May 14, 1998) was an American singer, actor, and producer who was one of the most popular and influential musical artists of the 20th century. He is one of the best-selling music artists of all time, having sold more than 150 million records worldwide. Born in Hoboken, New Jersey, to Italian immigrants, Sinatra began his musical career in the swing era with bandleaders Harry James and Tommy Dorsey. Sinatra found success as a solo artist after he signed with Columbia Records in 1943, becoming the idol of the "bobby soxers". He released his debut album, "The Voice of Frank Sinatra", in 1946. Sinatra's professional career had stalled by the early 1950s, and he turned to Las Vegas, where he became one of its best known performers as part of the Rat Pack. His career was reborn in 1953 with the success of "From Here to Eternity", with his performance subsequently winning an Academy Award and Golden Globe Award for Best Supporting Actor. Sinatra released several critically lauded albums, including "In the Wee Small Hours" (1955), "Songs for Swingin' Lovers!" (1956), "Come Fly with Me" (1958), "Only the Lonely" (1958) and "Nice 'n' Easy" (1960).
Document 4: Roy Clark: Roy Linwood Clark (born April 15, 1933) is an American singer and musician. He is best known for hosting "Hee Haw", a nationally televised country variety show, from 1969 to 1992. Roy Clark has been an important and influential figure in country music, both as a performer and helping to popularize the genre.
Document 5: Vern Yocum: Vern Yocum (April 15, 1909 - September 13, 1991) is best known as copyist and librarian for Frank Sinatra, Nat King Cole, and Nelson Riddle. Many of the top artists of the mid-20th century relied on Vern Yocum’s Music Service, which was walking distance from the Capitol Records Tower. His client list included: Frankie Laine, Billy Eckstine, Ella Fitzgerald, Rosemary Clooney, Mel Tormé, Peggy Lee, Steve Lawrence & Eydie Gorme, Keely Smith, Sammy Davis Jr., Trini Lopez, Nancy Wilson, Leslie Uggams, Roy Clark, and Julie Andrews.
Document 6: Roy Nichols: Roy Nichols (October 21, 1932 – July 3, 2001) was an American country music guitarist best known as the lead guitarist for country music legend Merle Haggard for more than two decades. He was known for his guitar technique, a mix of fingerpicking and pedal steel-like bends, usually played on a Fender Telecaster electric guitar. Nichols is considered one of the founders of the country music subgenre the “Bakersfield Sound,” which includes such notable country artists as Haggard, Buck Owens, Don Rich, [
Document 7: Vlado Meller: Vlado Meller is an audio mastering engineer, currently mastering at Vlado Meller Mastering in Charleston, South Carolina. Vlado masters across multiple genres of music, with credits on rock, hip-hop, pop, jazz, metal, dance, opera, Broadway, and classical albums. Over his 43-year career, Vlado has worked on many hit records and has worked with such artists as: Beastie Boys, Andrea Bocelli, Johnny Cash, Charlotte Church, Celine Dion, Duran Duran, Kenny G, Kenny Loggins, Julio Iglesias, Michael Jackson, Lil Wayne, Limp Bizkit, Linkin Park, Paul McCartney, Metallica, George Michael, Oasis, Pink Floyd, Public Enemy, Rage Against The Machine, Red Hot Chili Peppers, Shakira, Barbra Streisand, System Of A Down, A Tribe Called Quest, Weezer, Kanye West, Jack White, and many more. Vlado currently holds the position of senior mastering engineer at Vlado Meller Mastering in Charleston, South Carolina. He has won two Grammy awards.
Document 8: Capitol Records: Capitol Records, LLC (also referred to simply as Capitol and Hollywood and Vine) is an American major record label which operates as a division of the Capitol Music Group. The label was founded as the first West Coast-based record label in the United States in 1942 by industry insiders Johnny Mercer, Buddy DeSylva and Glenn E. Wallichs. In 1955, the label was acquired by the British music conglomerate EMI as its North American subsidiary. EMI was later acquired by Universal Music Group in 2012 and was merged with the company in 2013, making Capitol Records and the Capitol Music Group both a part of the Universal Music Group. Capitol Records' circular headquarter building located in Hollywood, Los Angeles is a recognized landmark of California. s of 2017 , artists signed to Capitol Records include Paul McCartney, Mary J. Blige, the Beach Boys, the Beastie Boys, Neil Diamond, Eagles, Katy Perry, Brian Wilson, Beck, Avenged Sevenfold, 5 Seconds of Summer, Don Henley, Sam Smith, Emeli Sandé, Troye Sivan, Tori Kelly, and Niall Horan.
Document 9: Roy Acuff: Roy Claxton Acuff (September 15, 1903 – November 23, 1992) was an American country music singer, fiddler, and promoter. Known as the "King of Country Music," Acuff is often credited with moving the genre from its early string band and "hoedown" format to the star singer-based format that helped make it internationally successful. In 1952 Hank Williams told Ralph Gleason, "He's the biggest singer this music ever knew. You booked him and you didn't worry about crowds. For drawing power in the South, it was Roy Acuff, then God."
Document 10: George Strait: George Harvey Strait (born May 18, 1952) is an American country music singer, songwriter, actor, and music producer. He is known as the "King of Country" and is considered one of the most influential and popular recording artists of all time. He is known for his neotraditionalist country style, cowboy look, and being one of the first and main country artists to bring country music back to its roots and away from the pop country era in the 1980s.
Document 11: Verna Arvey: Verna Arvey (February 16, 1910 – November 22, 1987) was an American librettist, pianist and writer who is best known for her musical collaborations with her husband William Grant Still, a musician and composer.
Document 12: Jimmy Riddle: James Lawrence Riddle (September 3, 1918 – December 10, 1982) was an American country musician and multi-instrumentalist best known for his appearances on the country music and comedy television show "Hee Haw". He was primarily known for the vocal art of eefing.
Document 13: Hee Haw: Hee Haw was an American television variety show featuring country music and humor with fictional rural "Kornfield Kounty" as a backdrop. It aired on CBS from 1969–1971 and remained popular in first-run syndication for an additional twenty-one years.
Document 14: Johnny Montagnese: Johnny Montagnese, a professional drummer for over thirty five years, has traveled the world extensively with many well known bands which enhanced his ability to play exceptionally well in a wide spectrum of music styles. He is also the owner and manager of Carriage House Studios in Stamford, CT, and a trusted and talented producer of many exceptional artists, from the Stylistics, Meatloaf, Beyoncé to Diana Ross, Pantera, and the Pixies to the Harlem Boys Choir to name just a few. . . Montagnese is also educated as a child psychologist which supports his desire to help young upstarts to get off the streets and into the studio. Carriage House Studios in Stamford, Connecticut has been nominated for two Grammy Awards and Johnny has offered Crescendo Productions Summer Rock Band Program the opportunity to study at the Studios and have at the students’ disposal, both analog and digital equipment.
Document 15: Archie Campbell: Archie Campbell (November 7, 1914 – August 29, 1987) was an American comedian, writer, and star of "Hee Haw", a country-flavored network television variety show. He was also a recording artist with several hits on the RCA label in the 1960s.
ground_truth: April 15, 1933