Roy Clark is a three-letter country singer from the United States. He is best known for his hit song 'Yesterday When I Was Young' and his appearances on the television show Hee Haw. Terri Clark is a five-letter country singer from Canada. She has released several albums, including her debut album 'Just the Same' and her most recent album 'Raising the Bar'. Reba McEntire is a four-letter country singer from Oklahoma. She has released over 30 studio albums and has won numerous awards, including 15 American Music Awards and two Grammy Awards.