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

Related documents: [0]  [DOC] 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. [END] 
[1]  [DOC] 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. [END]  
Answer: April 15, 1933
April 15, 1933