Question: The singer of "Thank God and Greyhound" is best known for hosting what nationally televised country variety show?

Context paragraphs:
Johnny Jolin: Johnny Jolin (born October 17, 1964 in Williamsport, Pennsylvania) is a notable American country music artist best known as the frontman of the critically acclaimed Johnny Jolin Band, being the lead vocalist for Country/Folk group The Front Porch Country Band and in 2011 by his Top-Ten hit single "Thank God."

Thank God and Greyhound: "Thank God and Greyhound" is a song made famous by country music singer Roy Clark.  Written by Larry Kingston and Earl Nix, the song was released in 1970 as the second single to the album "I Never Picked Cotton".  The song was a top 10 hit on the "Billboard" Hot Country Singles chart that November and reached the lower ends of the "Billboard Hot 100", peaking at #90.

Thank God (Hank Williams song): "Thank God" is a hymn written by Fred Rose and released as a posthumous single by Hank Williams in 1955 on MGM Records.  Rose had produced Williams' records and published his songs through his company Acuff-Rose.  The Roy Acuff hymn "The Battle of Armageddon" was the B-side.  "Thank God" was recorded between August 1948 and May 1949 at KWKH studio in Shreveport, Louisiana when the singer appeared on the Johnny Fair Syrup radio show.  Williams dubbed himself "The Ol' Syrupy Sopper" and performed alone with his guitar.

Thank God I'm a Country Boy: "Thank God I'm a Country Boy", also known as "Country Boy", is a song written by John Martin Sommers and recorded by American singer/songwriter John Denver.

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.

Let Them Be Little: Let Them Be Little is the seventh studio album by American country music singer Billy Dean.  His first album since "Real Man" seven years previous, it is also his first release on Curb Records.  The album was originally to have been released in 2003 on View 2 Records, which promoted the first two singles ("I'm in Love with You" and a cover of John Denver's "Thank God I'm a Country Boy").  Asylum-Curb promoted the third single, "Let Them Be Little", which was co-written by Richie McDonald, lead singer of Lonestar, and recorded by the band on their 2004 album "Let's Be Us Again".  After this song came "This Is the Life", "Race You to the Bottom" and "Swinging for the Fence".  Also included on the album are re-recordings of "Somewhere in My Broken Heart" and "Billy the Kid", two of Dean's early singles from 1991 and 1992.

Geechy Guy: Michael Paul Cathers (born May 12, 1964), known by his stage name, Geechy Guy, is a stand-up comedian who hails from the U.S. state of Michigan.  He is probably best known for his appearances on "Star Search", the nationally televised talent competition hosted by Ed McMahon.  While on the show, Guy coined the term "joke grenades" to describe jokes that trigger a delayed audience reaction.  Guy held the record for the most wins for a comedian (10) beating such comedians as Ray Romano and nine others.  He was defeated by Rondell Sheridan.

Lorraine Thomson: Lorraine Thomson is a Canadian dancer, television host, television producer and one of the co-founders, with Pierre Berton, of the ACTRA Awards.  She was the first dancer hired by the CBC for their first televised variety show, "The Big Revue", and made regular appearances as a dancer and actor on many television shows in the first decade of Canadian broadcasting.  She turned to radio hosting the 1960s, and then television hosting in the 1970s for CBC's "The Naked Mind", "The Weaker(?)  Sex" and "V.I.P." She was the one of the first women to produce variety shows on CBC, and for 18 years, she was the program coordinator for "Front Page Challenge".  She was nominated for several national awards for her work both in front of and behind the camera.

Heather Henderson: Heather Henderson (born March 7, 1973), also known as Baby Heather, is a professional burlesque dancer, singer, model, filmmaker, producer and host for Ardent Atheist and Skeptically Yours podcasts.  In 2012 Ardent Atheist won The People's Choice Podcast Awards in the religion inspiration category.  In 1989-1991 Henderson was a regular on the nationally televised Dance Party USA show where she appeared as Baby Heather.  In her teens, Henderson released a single called "Give it up Baby Heather" which received a positive review from "Billboard" magazine.  She currently is a member of Penn Jillette's "No God Band" and is a vocal activist for atheism and against psychics.

Thank God for Believers (song): "Thank God for Believers" is a song co-written by Mark Alan Springer, Roger Springer and Tim Johnson and was recorded by the American country music singer Mark Chesnutt.  It was released in July 1997 as the title track and first single from his album "Thank God for Believers".  It peaked at number 2 on the U.S. "Billboard" Hot Country Singles & Tracks chart and number 7 on the Canadian "RPM" Country Tracks chart.

Supporting paragraphs: Thank God and Greyhound Roy Clark
Answer: "Hee Haw",